Saturday, 5 November 2011

MCQs in ORAL HISTOLOGY Part- 2



M.C.Q. QUESTION

Dentin

1-Interglobular spaces:
a-   Do not contain dentinal tubules.
b-  Do not contain type I collagen.
c-   Are formed during the course of globular mineralization.
       d- Are seen only in secondary dentin.

2- Which would not be present in a ground section?
a- Inorganic crystals.
b-Odontoblast.
c- Interglobular space.
       d- Dentinal tubules.

3- A major difference between secondary and primary dentine is that:
        a- There is no predentine.
b- There is no hydroxyapatite.
c- There is no collagen fibers.
       d- The dentinal tubules pass in wavier course through secondary dentine.

4- The interglobular dentin is found:.
a-    Near the amelo-cemental junction.
b-   In the root dentin.
c-    Near the amelo-dentinal junction.
d-   Near the dentino-cemental junction.

5- Which of the following is MOST likely to be found in the dentinal tubules:             
a- Tomes' fibers.
b- Oxytalan fibers.
c- Tomes' process.
d- Thick collagen fibers.

6- Primary dentin differs from both secondary and reparative dentin in that:
a-  Its matrix is calcified.
b- Its inorganic component is hydroxyapatite.
c-  It usually has a greater number of tubules per unit area.
d- It is produced by mesenchymal cells.

7- Which of the following is not present within dentin?
a-      Cell bodies.
b-     Hydroxyapatite.
c-      Collagen type I.
        d- Incremental lines.



8- Which of the following is true of  peritubular dentin ?It :
a-    Is less mineralized than intertubular dentin.
b-   May be considered as intratubular dentin.
c-    Is best visualized in decalcified sections.
d-   Is found in the interglobular dentin.

9- Which of the following is not present in odontoblasts?
a-    Golgi saccules and vesicles.
b-   Rough endoplasmic reticulum.
c-    Desmosome-like junctions.
      d- Numerous processes forming a striated border.

10- Human primary dentin contains:
a-     Mantle & circumpulpal dentin.
b-    Tomes' process.
c-     Cell bodies.
d-    Atubular dentin.

11- Which of the following is considered as age changes?
a-     Transparent dentin.               
b-    Cellular cementum.                
c-     Primary dentin.
     d- Enamel spindle.

12- Which of the following is true:
a-     A layer of predentin is found between primary and secondary dentin.
b-    Dentinal tubules do not pass through interglobular dentin.
c-     The physiological  secondary  dentin contain dentinal tubules.
d-    Many large collagenous fiber bundles are found in the dentinal tubules.

13- Reparative dentin:
a-     Contain regular and numerous dentinal tubules.
b-    Obliterates the apical foramen.
c-     Forms on localized regions of the pulpal surface of the dentin.
d-    Formation is induced by the cells of the inner dental epithelium.

14- Matrix vesicles are present during:
a-     The initial mineralization of dentin.
b-    The initial mineralization of enamel.
c-     The initial mineralization of cementicles.
d-    The initial mineralization of denticles.



15- Which of the following is least prominent in odontoblasts and secretory ameloblasts?
a-            Rough endoplasmic reticulum.
b-            Mitochondria.
c-             Golgi apparatus.
d-            Lysosomes.

16- Collagenous fibers are not found in:
a-            Mantle dentin.
b-            Reparative dentin.
c-             The outer prismless layer.
  d-     The dental sac.

17- Obliteration of the dentinal tubules by mineral deposits:
a-            Occurs only when the dentin becomes exposed to the oral fluids.
b-            Produces dead tracts.
c-             First occurs in predentin.
  d-     Is seen in sclerotic and transparent dentine.

18- Tome's granular layer is:
a-            An extension of odontoblast processes into enamel.
b-            A  region lacking dentinal tubules.
c-             Following the incremental lines.
  d-     Derived from the epithelial rests of Malassez.

19- Amelogenesis and dentinogenesis are similar in which respect?
a-            Both processes involve the secretion of collagenous fibers
          impregnation with hydroxy-apatite crystals.
b-            Both processes involve maturation with hydroxyappatite crystals.
c-             Both processes start simultaneously at the early crown stage.
d-            Both processes continue throughout the life of the tooth.

20- Which of the following is wrong?
a-            The formation of primary dentin continues throughout life.
b-            Primary dentin contains a significantly higher number of tubules per unit
          volume.
c-             Reparative dentin forms as a response to injury.
d-            Dead tracts are more common in secondary than in primary dentin.

 

21- Which of the following has the highest mineral content?
a-   Predentin.
b-   Peritubular dentin.
c-    Intertubular dentin.
  d- Cementum.


22-Dentin is a variety of Connective tissue because it:
a- is elastic and contains mucopolysaccharides.
b- contains collagen fibers and cell processes derived from mesenchyme.
c- contains inorganic cells.
d- has few cells and much intercellular material.

23-Cementum is a tissue that:
a- provides attachment of periodontal ligament fibers.
b- is easily resorbed than bone.
c- it contains blood vessels.
d- it contains neural receptors.

24-Cementum deposition cervically on enamel surface is due to:
a- premature degeneration of epithelial root sheath of Hertwig.
b- loss of reduced enamel epithelium.
c- persistence of epithelial root sheath of Hertwig.
d- cementoblasts coming from dental sac.

25-Neonal line is present in:
a- enamel and cementum.                    b- dentin and cementum.
c- enamel and dentin.                           d- non of the above.

26-Obliteration of dentinal tubules by minerals will result in:
a- formation of dead tracts.                
b- formation of secondary dentin.
c- formation of sclerosed dentin.
d- formation of irregular or reparative dentin.

27-Age changes will increase:
a- dentin sclerosis.                                  b- interglobular dentin.
c- in cementum thickness.                      d- Tome's granular layer.

28-formation of matrix vesicles in calcification of dentin is limited to:
a- circumpulpal dentin.                 b- Mantle dentin.
c- all types of dentin.                    d- non of the above.

 

 







Answers of MCQ

Dentine

1
c
15
d
2
b
16
c
3
d
17
d
4
c
18
b
5
a
19
b
6
c
20
a
7
a
21
b
8
b
22
b
9
d
23
a
10
a
24
b
11
a
25
c
12
c
26
c
13
c
27
a
14
a
28
b

















Cementum


1- Cementum may cover part of the enamel due to:
a-  Premature differentiation of cementoblasts.
b- Destruction of the reduced enamel epithelium covering this part.
c-  Malfunctioning of the maturative ameloblasts.
        d- Premature destruction of the epithelial root sheath of Hertwig.

2- Which of the following cell is responsible for cementogenesis?
a-     Ameloblast.
b-    Osteoblast.
c-     Cementoblast.
         d-Odontoblast.

3- Which of the following is true about cementum? It:
a-    Provides nutrients to secondary dentin in the root.
b-   Provides for the attachment of principal periodontal fibers.
c-    Contains neural receptors.
d-   Is more easily resorbed than bone.

4- Which of the following is not a feature of cellular cementum?
a-    Lacunae and canaliculi.
b-   Continuous remodeling.
c-    Sharpey's fibers.
      d- Incremental lines.

 

5- Cementum may be deposited on the surface of enamel as a consequence of:
a-     Early degeneration of Hertwig's sheath.
b-    Injury to the reduced enamel epithelium.
c-     Late degeneration of Hertwig's sheath.

     d-During passive eruption.

 

6- Cementoblasts:
a-     Are derived from the dental papilla.
b-    Secrete both collagen and glycosaminoglycans.
c-     Are multinucleated cell.

     d-  May become incorporated into acellular cementum.

 






7- Which of the following is not present inside both cellular and acellular cementum:
a-            Cementoblasts
b-            Hydroxyapatite crystals.
c-             Incremental lines.

  d-     Sharpey's fibers.

 

8- Which of the following does not increase normally with age?
a-            Pulp stones.
b-            Dentin sclerosis.
c-             Interglobular dentin.

  d-    Cementum thickness.

 
9-human teeth contain varities of cementum:
a- acelllular extrinsic fiber cementum.
b- cellular intrinsic fiber cementun.
c- mixed stratified cementum.
d- all of the above.

10-Incremental lines of Salter are:
a- highly mineralized areas having less collagen and great amount of  mucopolysaccharides.
b- hypomineralized areas containing less collagen and great amount of  mucopolysaccharides.
c- unmineralized areas containing no collagen nor mucopolysaccharides.
d- similar to cementum mineralization.

11-cementum hypertrophy occurs:
a- in non functioning teeth.                  b- functioning teeth.
c- in embedded teeth.                           d- in malposed tooth

12-Cementoblasts are derived from:
a- epithelial root sheath of Hertwig.
b- epithelial rests of Malassez.
c- cells of dental papilla.
d- ectomesenchymal cells of tooth sac.

13- Persistance of epithelial root sheath of Hertwig will result in:
a- Formation of intermediate cementum.
b- No cementum formation.
c- Formation of acellular cementum.
d- Formation of accessory root canal.




Answers of MCQ

CEMENTUM

1
b
8
c
2
c
9
d
3
b
10
a
4
b
11
b
5
b
12
d
6
b
13
b
7
a


























Pulp


1- The nerve supply within the dental pulp provides for:
a-  Pain perception, vascular control and proprioception.
b- Thermal perception, vasodilatation and cementum sensitivity.
c-  Pain perception, dentin sensitivity and vascular control.
d- Proprioception, taste and vasoconstriction.

2- With age, the volume of the pulp decreases because of:
a-     A decrease in the number of collagenous fibers.
b-    The formation of secondary dentin.
c-     Sclerosis of radicular dentin.
d-    A decrease in number of fibroblasts.

3- The true pulp stone is formed usually:
a-     In large size.
b-    In the coronal pulp.
c-     In the radicular pulp.
d-    Around degenerated nidus.

4- The pulp sensation is:
a-            Touch.
b-            Propioceptive.
c-             Pain sensation.
   d-     Cold.

5- As a result of aging, the dental pulp in human permanent teeth:
a-            Increase in size and becomes more vascular.
b-            Becomes less cellular and more fibrous.
c-             Becomes more cellular and contains more ground substance.
   d-     Becomes more vascular and contains larger neural elements.
 
6- An embedded pulp stone is most likely to be surrounded by:
a-            Fibrous tissue.
b-            Primary dentin.
c-             Secondary dentin.
d-            Odontoblasts.
     
7- Which of the following is thought to protect the dental pulp?
a-            Sclerotic dentin.
b-            Dead tracts.
c-             Tome's granular layer.
   d-     Denticles.


8- A false denticle:
a-            Consists of dentinal tubules.
b-            Is usually associated with a dead tract.
c-             Indicates a dead or dying pulp organ.
  d-    Consists of concentric layers of calcification.

9- Dental pulp develops from:
a- Dental organ.                                       b- Dental sac.
c- Dental papilla.                                     d- Dental lamina.

10- Nucleus with cart wheel appearance is found in:
a- Plasma cells.                                          b- Lymphocytes.
c- Progenitor cells.                                   d- Mast cells.

11- Extracellular matrix of the connective tissue of the pulp is composed of:
a- Collagen fibers only.                             b- Ground substance only.
c- Both 1&2.                                              d- Non of the above.

12- Pericytes are contractile cells that surround the endothelial cells of:
a- Arterioles.                                           b- Venules.
c- Lymph vessels.                                     d- Capillaries.

13- Pulp tissue has receptors for:
a- Heat.                                                  b- Pain.
c- Pressure.                                           d- All of the above.















Answers of MCQ

PULP

1
c
8
d
2
b
9
c
3
c
10
a
4
c
11
c
5
b
12
d
6
c
13
b
7
a


























Periodontal ligament

1- The PDL fibers running between two adjacent teeth:
a- Belong to the dento-alveolar group.
b-Are gingival fibers.
c- Are transseptal fibers.

       d- Are oxytalan fibers.


2- Which of the following is not true of the alveolodental periodontal fibers? They:
       a- Are organized into bundles with different orientation.
       b- Are derived from epithelial rests of Malassez.
c-    Undergo continuous remodeling.

      d- Are formed and partially resorbed by fibroblasts.

 

3- Which of the following is not present in the periodontal ligament?
a-    Epithelial rests of Malassez.
b-   Fibroblasts.
c-    Cementoblasts.

      d- Osteocytes.

 

4- Which of the following principal fibers groups constitutes the main attachment of the tooth?
a-            Oblique group.
b-            Apical group.
c-             Horizontal group.
  d-    Alveolar group.

5- Which of the following groups of tissues comprise the periodontium?
a-            Alveolar bone, periodontal ligament, cementum.
b-            Periodontal ligament, cementum, gingiva.
c-             Cellular cementum, periodontal ligament, alveolar bone.
  d-     Cementum, alveolar bone, periodontal ligament, gingiva.
 
6- The width of the periodontal ligament:
a-            It is thiner when teeth are functioning normally.
b-            It is narrowest at the level of the midroot area.
c-             It becomes wider with aging.
d-            It is of uniform width around multi-rooted teeth.

7- The periodontal ligament develops from:
 a- Dental organ.                                       b- Dental sac.
c- Dental papilla.                                     d- Dental lamina.


8- Elasticity of periodontal ligament is due to:
a- Presence of elastic fibers.                       
b- Presence of oxytalan fibers.
c- Wavy coarse of collagen fibers.
d- Non of the above.

9- The principal fibers of periodontal ligament are:
a- Elastic.                                b- Oxytalan.
c- Collagen.                             d- Precollagen.

10- Function of oxytalan fibers:
a- Support nerves.                                       b- Support blood vessels.
c- Help fibroblasts migration.                  d- All of the above.

11- Open faced nucleus is found in:
a- Resorptive cells.                                          b- Synthetic cells.
c- Defensive cells.                                   d- Progenitor cells.

12- The periodontal ligament is formed of:
a- Cells only.                                          b- Fibers only.
c- Ground substances only.                    d- All of the above.

13- The protective function of periodontal ligament is achieved by its:
a- Fibers.                                                b- Blood vessels.
c- Nerves.                                                    d- All of the above.
 














Answers of MCQ

PERIODONTAL LIGAMENT

1
c
8
c
2
b
9
c
3
d
10
d
4
a
11
b
5
d
12
d
6
b
13
d
7
b

























Bone structure and alveolar process


1- Which of the following best describes the alveolar bone proper?
a-     It is composed of lamellar bone only.
b-    It is composed of bundle bone and lamellar bone.
c-     It is composed entirely of bundle bone.
     d- It is composed of spongy bone only.

 

2- The alveolar bone proper is composed of:
a- Spongy & woven bone.
b- Bundle & lamellar bone.
c- Compact bone only.
           d- Compact & spongy bone.

3- Which of the following is true:
a-     Normal long bone contains woven bone.
b-    Reversal lines represent rhythmic apposition of bone.
c-     Growth line of bone disappears at 5 years.
     d- Lamellated bone contains resting lines.

4- Which of the following is wrong?
a- The cribriform plate is another name for alveolar bone proper.
b- Sharpey's fibers are present in bundle bone.
c- Bundle bone develops from the dental sac.

     d- Bundle bone is not resorbed.

 

5- Which of the following best describes the alveolar bone proper?
a-            Woven bone and spongy bone.
b-            Lamellar bone and bundle bone.
c-             Bundle bone and cancellous bone.
d-            Woven bone and lamellar bone.

 

6- Which of the following is not related to the incremental lines:
a-            Resting lines.
b-            Hunter-schreger bands.
c-             Lines of Von Ebner.
d-            Retzius lines.

7- Which of the following is not universal component of all hard tissues in man?
a-            Collagen.
b-            Calcium.
c-             Phosphorous.

  d-     Water.

 


8- The major difference between cellular cementum and bone is the:
a-            Blood supply.                                          C- Presence of Sharpey's fibers.
b-            Cellularity.                                               d- Organic matrix.






























Answers of MCQ

BONE

1
b
5
b
2
b
6
b
3
d
7
a
4
d
8
a



























Oral mucous membrane


1- Sulcular epithelium is formed of:
a-  Nonkeratinized stratified squamous epithelium.
b- Parakeratinized stratified squamous epithelium.
c-  Orthokeratinized stratified squamous epithelium.
d- Columnar epithelium.

2- Which of the following is a wrong statement about the dentogingival junction?
            a- It has an epithelial and a connective tissue component.
           b- It shifts apically with age.
            c- Its coronal end corresponds to the bottom of the gingival sulcus.
           d- Its epithelial cells are keratinized stratified squamous.

3- Keratinized epithelium differs from nonkeratinized epithelium in that:
a-    It contains granular cell layer.
b-   Contain a higher glycogen content.
c-    It does not contain basal lamina.
d-   No tonofilaments are found in it.

4- The buccal mucosa:
a-    Has a keratinized epithelium.
b-   Is continuous with the gingival mucosa.
c-    It is firmly attached to the underlying tissues.
d-   Has numerous connective tissue papillae.

5- Masticatory mucosa has:
a-    Elastic fibers in its lamina propria.
b-   Elastic fibers in its blood vessels wall.
c-    Stratum corneum.
d-   No connective tissue papillae.

6- Which of the following is true of the sulcular epithelium?
a-    Consists of keratinized epithelium.
b-   Has submucosa.
c-    Is nonkeratinized.
d-   Contain connective tissue papillae.

7- Parakeratinized epithelium is found in:
a-    Gingiva.
b-   Vestibular fornix.
c-    Floor of the mouth.
d-   Ventral surface of tongue.

8- In which area the connective tissue papillae are long & numerous?
a-    Buccal mucosa.
b-   Gingiva.
c-    Alveolar mucosa.
d- Floor of the mouth.  

9- The mucogingival junction is the junction of:
a-     Sulcular epithelium & free gingiva.
b-    Free gingiva and attached gingiva.
c-     Alveolar mucosa and attached gingiva.
     d- Palatine gingival & rougae zone.

10- The mucosa of the dorsal surface of the tongue is:
a-     Spesialized mucosa.
b-    Masticatory mucosa.
c-     Linning mucosa.
d-    Smooth surface.

11- Which of the following represents the correct innervation of fungiform papilla?
a-     Chorda tympani.
b-    Facial nerve.
c-     Trigeminal nerve.
     d- Glossopharyngeal nerve.

12- Which of the following appears to play an important role in attachment of its cells:
a-     Keratohyaline granules.
b-    Desmosomes.
c-     Glycogen contents.
     d-  Lysosomes.

13- The structure of the oral mucosa is:
a-     Epithelium and basement membrane.
b-    Mucosa & submucosa.
c-     Epithelium, lamina propria and muscular layer.
d-    Epithelium, lamina propria and basement membrane.

14- Healthy line is represented in:
a-     Mucogingival junction.
b-    Free gingival groove.
c-     Junction of the palatine gingiva and the lateral surface of the palate.
     d- Junction of the buccal and labial mucosa.



15- Fungiform papillae:
a-     Are seen as white spots.
b-    Have a stratum corneum.
c-     Carry taste buds.

     d-  Have a lamina propria which is poorly vascularized.

 

16- Which of the following is true regarding the dentogingival junction?
a-     It is derived entirely from ectomesenchyme.
b-     It moves apically with age.
c- It moves occlusally with age.
d-     Contains clear submucosa.

 

17- Which of the following regions has a non-keratinized epithelium and is loosely attached to the underlying structures?
a-     Buccal mucosa.
b-    Attached gingiva.
c-     Hard palate.
d-    Vestibular fornix.

18- The floor of the mouth is lined by:
a-     Linning mucosa loosely attached .
b-    Linning mucosa firmly attached.
c-     Specialized mucosa.

     d-  Masticatory mucosa.

 

19- Keratohyaline granules in epithelial cells of keratinized mucosa are associated with:
a-     The tonofilaments.
b-    Prickle cell layer.
c-     Basal cell layer.
d-    Stratum granulosum.

 

20- Which of the following contributes to the reddish coloration of the vermilion border?
a-            Thichness of oral epithelium.
b-            Existance of high number of langerhans cells.
c-             Vascularity of the lamina propria.
d-            Epithelial keratinization.

21- Which of the following are not usually found in the keratinocytes of  the
         stratum spinosum of keratinized oral epithelium?
a-            Keratohyaline granules
b-            Tonofibrils.
c-             Membrane coating granules.
  d-     Ribosomes.

 

22- The sulcular epithelium:
a-            Is keratinized.
b-            Has thick epithelial layer.
c-             Has long epithelial ridges.
d-            Is nonkeratinized.

23- Taste buds are not found on:
a-            Filliform papillae.
b-            Fungiform papillae.
c-             Foliate papillae.

  d-    Circumvallate papillae.

 

24- Which of the following is not present in the stratum spinosum?
a-            Desmosomes.
b-            Tonofilaments.
c-             Keratohyaline granules.
d-            Odland's bodies.

25- Which of the following mucosa has a non-keratinized epithelium :
a-            Free gingiva.
b-            Attached gingiva.
c-             Mucosa of the floor of the mouth.
d-            Palatal mucosa.

26- Which of the following is a transiant cell in the oral epithelium:
a-            Melanocyte.
b-            Lymphocyte.
c-             Merkel cell.

  d-     Langerhans cell.

 

27- Which of the following serves as a source of the cells which form the attachment epithelium?
a-            Dental sac.
b-            Reduced enamel epithelium & gingiva.
c-             Enamel cuticle.
d-            Vestibular lamina.

28- The mode of attachment of the junctional epithelium is:
a-            Basement membrane.
b-            Basal lamina & hemidesmosome.
c-             Enamel cuticle.
d-            Odland's bodies.



29- Which of the following is true of the attachment epithelium?
a-            Its coronal end is found at the bottom of the gingival sulcus.
b-            Its apical migration is the major causative factor in active eruption.
c-             Is impermeable to dyes and fluids.

  d-     Can migrate coronally.


30- Which of the following cells synthesize protein which remains within the cell without secretion:
a- Osteoblasts.
b- Plasma cell.
c- Fibroblast.

  d- Keratinocyte.

 

  31- Which of the following papillae of the tongue do not contain taste buds:
a- Filliform.
b- Vallate.
c- Foliate.
d- Fungiform.

   32- Which is not true about taste buds:
a- The supporting cells of a taste bud carry taste hairs.
b- 10 to 20 neuroepithelial cells are the receptors of taste stimuli in a taste bud.
c- Taste buds extend from the basal lamina to the surface of epithelium.
d- Nerve fibers end in contact with the sensory cells in the taste buds.

     33- Those papillae of the tongue which are the largest, having many
                taste buds and are associated with the duct of Von Ebner's gland are:
a- Folliate.
b- Filliform.
c- Fungiform.
d- Circumvallate.

    34- Glands emptying the circumvalate trough are the:
a- Mucous glands.
b- Serous glands.
c- Glands of Nuhn.
d- Mucous and serous mixed glands.

    35- Tongue papillae responsible for bitter taste sensation:
a- Filliform papillae.
b- Fungiform papillae.
c- Circumvallate papillae.
d- Foliate papillae.

 



Answers of MCQ

ORAL MUCOSA

1
a
19
d
2
d
20
c
3
a
21
a
4
c
22
d
5
b
23
a
6
c
24
c
7
a
25
c
8
b
26
b
9
c
27
b
10
a
28
b
11
a
29
a
12
b
30
d
13
d
31
c
14
a
32
a
15
c
33
d
16
b
34
b
17
d
35
c
18
a














Salivary gland


1- Mucous cells of salivary glands have:
a-     Rounded nuclei.
b-    Flattened nuclei.
c-     Form the cap of the demilunes.
d-    Have zymogen granules.

2- Which of the following is not function of the striated duct?
a-     Iodine secretion.
b-    Zymogen secretion.
c-     Sodium & chloride transport.
     d- Potassium & calcium transport.

3- Which of the following is not characteristic of serous cells of a salivary gland?
a-     The cells are pyramidal in shape.
b-    Its secretory granules are called zymogen granules.
c-     They are capped by mucous cells in a mixed salivary acinus.
d-    There is junctional complexes between the secretory cells.

4- Which of the following adult gland is incorrectly paired with its secretion?
a-     Parotid - pure serous.
b-    Palatal salivary glands - pure mucous.
c-     Submandibular - mixed salivary gland.
     d- Sublingual - pure serous.

5- The secretory canaliculi in salivary gland is found in:
a-     mucous acini.
b-    Striated ducts.
c-     Serous acini.
d-    Main duct.

6- The excretory ducts of the major salivary glands are lined with:
a-     Simple cubiodal epithelium with goblet cells.
b-    Simple columnar without goblet cells.
c-     Stratified squamous epithelium with goblet cells.
     d-  Pseudostratified columnar epithelium with goblet cells.

7- The cytoplasmic basophilia observed in acinar cells of the adult parotid gland is due to:
a-     Mucigen granules.
b-    Ribosomes.
c-     Glycoproteins.
     d-Lysosomes.



8- Pure mucous salivary gland is:
a-   Parotid gland.
b-  Major sublingual glands.
c-   Glossipalatine gland
d-  Submandibular gland.

9- The basophilia observed in acinar cells of the parotid gland is due to:
a-            Mucigen granules.
b-            Lysosomes.
c-             Glycoproteins.
d-            Ribosomes.

10- In the demilune of the mixed salivary acinus, the mucous secretory cells:
a-            Have rounded nuclei.
b-            Form demilune cappings.
c-             Have zymogen granules.
d-           Line the luminal surface of the acinus.

11- The concentration of sodium and chloride in saliva is controlled by:
a-            Highly differentiated serous cells.
b-            Well developed mucous cells.
c-             Striated ducts.
d-            Intercalated ducts.

12- The role of the myoepithelial cells in the salivary glands is:
a-            Defensive mechanism.
b-            Contraction of the acinus.
c-             Prevention of collapse of the acini.
  d-    Prevention of extravasation of saliva into the glandular stroma

13- Which of following is most likely to be a product of a salivary gland serous cell?
a-            Collagenase enzymes.
b-            Mucous secretion.
c-             Synovial fluid.
d-            Enzyme which digests starch and other polysaccharides

14- Which of the following glands has a purely serous secretion?
a-            Labial.
b-            Anterior lingual.
c-             Submandibular.
d-            Von Ebner's.


15- The secretions of salivary glands are:
a- Exocrine and holocrine.
b- Exocrine and merocrine.
c- Exocrine and apocrine.
d- Endocrine and merocrine.

  16- Which minor salivary glands are purely serous:
a- Lingual glands of Von Ebner.
b- Lingual glands of Blandin Nuhn.
c- Palatine glands.
d- Labial and buccal glands.

   17- A serous acinar cell has all the following characteristic except:
a- Numerous secretory granules in apical cytoplasm.
b- Cytoplasm is abundant and basophilic.
c- Basal cell membrane has many infolding between which rows of mitochondria are lodged.
d- Extensive rough endoplasmic reticulum is present.

     18- The groups of entirely serous adult salivary glands are:
a- Von Ebner's and palatal.
b- Parotid and Von Ebner's.
c- Parotid and submandibular.
d- Sublingual and submandibular.

     19- The ducts of the salivary glands that are lined by a single layer of
             tall columnar cells with radially arranged mitochondria are known as:
a- Lobar ducts.
b- Striated ducts.
c- Intercalated ducts.
d- Interlobar ducts.

       20- Large cells with a small pyknotic nucleus and abundant cytoplasm, mainly in the parotid and submaxillary glands are the:
a- Myoepithelial cells.
b- Oncocytes.
c- Serous cells.
d- Cells of the intercalated ducts.

      21- Thin branching tubes of varying lengths that connect the terminal portions with the striated ducts of salivary glands are:
a- Interlobular ducts.
b- Intercalated ducts.
c- Intralobular ducts.
d- lobar ducts.

      22- Which of the following is not true of parotid glands:
a- Stenson's duct opens in the cheek opposite maxillary second molar.
b- Predominantly serous gland.
c- Long, branching intercalated ducts are present.
d- Serous demilunes cap mucous secretory units.

   23- Which of the following is false about sublingual glands:
a- The excretory duct opens at the sublingual caruncle.
b- It is a predominantly mucous gland.
c- They have poorly developed striated ducts.
d- They have a long branching intercalated duct structure.


























Answers of MCQ

SALIVARY GLANDS

1
b
13
d
2
b
14
d
3
c
15
b
4
d
16
a
5
c
17
c
6
d
18
b
7
b
19
b
8
c
20
b
9
d
21
b
10
d
22
d
11
c
23
d
12
b



















Maxillary sinus

1- Which of the following is true concerning the maxillary sinus?
a-    It begins to develop at age 6 months .
b-   Its growth is by pneumotization.
c-    It is lined by pseudostratified squamous epithelium.
d-   Its opening is in the oral cavity.

 2- Maxillary sinus open in the:
a-                         Medial nasal conche.
b- Superior nasal meatus.
c-  Inferior nasal meatus.
  d- Medial nasal meatus.























Answers of MCQ

MAXILLARY SINUS

1
b
2
d






























Tempro-mandibular joint

1- The TMJ does not contain:
a-     Articular disc.
b-    Capsular ligament.
c-     Synovial membrane.
d-    Blood vessels in its covering fibrous connective tissue.

2- Which is true of the T.M.J?
a-     An epithelium lines the synovial membrane.
b-    It has a highly vascular articulator disc.
c-     The articular surfaces are covered by a dense fibrous C.T.
d-    The articular disc is attached to the roof of the glenoid fossa.

3- The head of the mandibular condyle:
a-     Articulates with the roof of the glenoid fossa.
b-    Develops from the secondary cartilage.
c-     Lacks hyaline cartilage.
d- Consists of spongy bone only.

4-Which of the following statement about TMJ is true:
a- TMJ is a bilateral synovial articulation between the mandible and the cranium.
b- TMJ is a unilateral synovial articulation between the mandible and the cranium.
c- TMJ is a unilateral synovial articulation between the maxilla and the cranium.
d- TMJ is a bilateral synovial articulation between the maxilla and the cranium.

5- TMJ development starts at:
a- 3 MIU.                                                             b- 4 MIU.
c- 5 MIU.                                                             d- 6 MIU.

6- TMJ Condyle is:
a-Strongly convex in the antroposterior direction & slightly convex mediolaterally.
b- Strongly convex in the mediolateral direction & slightly convex antroposteriorly.
c- Concavo-convex.
d-Concave in the antroposterior direction & convex in the mediolateral direction.

7-The secondary cartilage present in the head of the TMJ condyle remains active till:
a- The end of the 3rd decade.
b- The beginning of the fourth decade.
c- The end of the second decade.
d- The beginning of the second decade.



8- Glenoid fossa is:
a- A depression on the inferior surface of the squamous part of the temporal bone.
b- An elevation on the inferior surface of the squamous part of the temporal bone.
c- A depression on the anterior surface of squamous part of the temporal bone.
d- An elevation on the inferior surface of the zygomatic part of the temporal bone.

9- The glenoid fossa is limited:
a- Medially by the spine of sphenoid & laterally by the root of the zygomatic process of the temporal bone.
b- Laterally by the spine of sphenoid & Medially by the root of the zygomatic process of the temporal bone.
c- Medially by the root of the zygomatic process of the temporal bone & laterally by the spine of sphenoid.
d- Medially by the spine of sphenoid & laterally by the squamous part of the temporal bone.

10- TMJ articular eminence is:
a- Present at birth.
b- Absent at birth.
c- Formed during birth.
d- Present at childhood.

11- TMJ disk is:
a- Biconcave of uneven thickness.
b- Concavo-convex of uneven thickness.
c- Biconcave of even thickness.
d- Concavo-convex of even thickness.

12- One of the following is not  the exact function of TMJ ligament:
a- Prevent lateral displacement of one joint & medial displacement of the other.
b- Limit the amount of inferior displacement.
c- Prevents posterior displacement.
d- Restricts the TMJ displacement in all planes.

13- The TMJ large marrow spaces:
a- Remain unchanged.
b- Increases by age.
c- Decrease by age.
d- Rich in collagen type l

14- TMJ collagen fibers show alternating dark & light bands when viewed in polarized light which indicate that:
a- They are wavy or crimped.
b- They are straight.
c- They are twisted.
d- They are corrugated.

15- Condylar cartilage cells:
a- Increase in number with age.
b- Decrease in number with age.
c- Remain unchanged.
d- Degenerate with age.

16- The hyaline cartilage in the condyle serves as an active growth center till the age of:
a- 30 years.                                                  b- 10 year.
c- 20 years.                                                  d- 40 years.

17- The periodicity of the crimping seen in TMJ collagen fibers is of the order of:
a- 30-40 µm.                                                  b- 15-20 µm.
c- 10-25 mm.                                                 d- 15-30 mm.

18- The ground substance of TMJ disk comprises about:
a- 10% of its dry weight.                               b- 5% of its dry weight.
c- 12% of its dry weight.                               d- 8% of its dry weight.

19- Which of the following statements about TMJ intra- articular disk is true:
a- About ⅔ of glygosaminoglycans is chondroitin sulphate & about ⅓ is dermatan sulfate.
b- About ⅓ of glygosaminoglycans is chondroitin sulphate & about ⅔  is dermatan sulfate.
c- About ⅛ of glygosaminoglycans is chondroitin sulphate & about ⅜  is dermatan sulfate.
d- About ⅜ of glygosaminoglycans is chondroitin sulphate & about ⅛   is dermatan sulfate.

20-The TMJ disk is:
a- Avascular & not innervated in its central region.
b- Vascular & innervated.
c- Avascular & innervated.
d- Vascular & not innervated.

21- At rest the hydrostatic pressure of TMJ synovial fluid has been reported as being:
a- Atmospheric.                          
b-Supra-atmospheric.
c- Sub-atmospheric. 
d- Sometimes sub-atmospheric & other times atmospheric.



22- Which one of the following is not a function of the TMJ synovial fluid:
a- Lubricatiuon.                                            b- Nourishment.
c- Debridement.                                           d- Pressure dampening.

23- The vascular supply to the TMJ comes from:
a- External carotid artery.
b- Internal carotid artery.
c-Common carotid artery.
d- Both External & Internal carotid arteries.

24- The TMJ takes branches from:
a- The mandibular division of the trigeminal nerve.
b- The maxillary division of the trigeminal nerve.
c- The ophthalmic division of the trigeminal nerve.
d- The facial branch of the mandibular nerve.



























Answers of MCQ

TEMPRO-MANDIBULAR JOINT
1
d
13
c
2
c
14
a
3
a
15
a
4
a
16
c
5
a
17
b
6
a
18
b
7
c
19
a
8
a
20
a
9
a
21
c
10
b
22
d
11
a
23
a
12
d
24
a


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