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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