Temporal mandibular joint

Question 1

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

Answer 1

d

Question 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.

Answer 2

c

Question 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.

Answer 3

a

Question 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.

Answer 4

a

Question 5

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

Answer 5

a

Question 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.

Answer 6

a

Question 7

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.

Answer 7

a

Question 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.

Answer 7

c

Question 8

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.

Answer 8

a

Question 9

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

Answer 9

b

Question 10

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

Answer 10

c

Question 10

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.

Answer 10

a

Question 11

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.

Answer 11

d

Question 12

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

Answer 12

a

Question 12

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.

Answer 12

a

Question 13

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.

Answer 13

c

Question 14

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.

Answer 14

bb

Question 15

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.

Answer 15

b

Question 16

Which of the following statements about TMJ intra- articular disk is true:
a- About 2⁄3 of glygosaminoglycans is chondroitin sulphate & about 1⁄3 is dermatan sulfate.
b- About 1⁄3 of glygosaminoglycans is chondroitin sulphate & about 2⁄3 is dermatan sulfate.
c- About 1⁄8 of glygosaminoglycans is chondroitin sulphate & about 3⁄8 is dermatan sulfate.
d- About 3⁄8 of glygosaminoglycans is chondroitin sulphate & about 1⁄8 sulfate.

Answer 16

a

Question 17

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

Answer 17

a

Question 18

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.

Answer 18

c

Question 19

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.

Answer 19

a

Question 19

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

Answer 19

d

Question 20

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.

Answer 20

a