MCQs in Oral Histology

Chapter 14: TMJ

 

1- The component of future TMJ shows development at:

 

  1. 6 weeks
  2. 10 weeks
  3. 18 weeks
  4. 16 weeks

 

 

 

 

 

 

 

The answer is: B

 

1- The TMJ does not contain:

  1. Articular disc.
  2. Capsular ligament.
  3. Synovial membrane.
  4. Blood vessels in its covering fibrous connective tissue.

 

 

 

 

 

 

 

The answer is: D

 

2- Which is true of the T.M.J?

  1. An epithelium lines the synovial membrane.
  2. It has a highly vascular articulator disc.
  3. The articular surfaces are covered by a dense fibrous C.T.
  4. The articular disc is attached to the roof of the glenoid fossa.

 

 

 

 

 

 

 

The answer is: C

 

3- The head of the mandibular condyle:

  1. Articulates with the roof of the glenoid fossa.
  2. Develops from the secondary cartilage.
  3. Lacks hyaline cartilage.
  4. Consists of spongy bone only.

 

 

 

 

 

 

 

The answer is: A

 

4-Which of the following statement about TMJ is true:

  1. TMJ is a bilateral synovial articulation between the mandible and the cranium.
  2. TMJ is a unilateral synovial articulation between the mandible and the cranium.
  3. TMJ is a unilateral synovial articulation between the maxilla and the cranium.
  4. TMJ is a bilateral synovial articulation between the maxilla and the cranium.

 

 

 

 

 

 

 

The answer is: A

 

5- TMJ development starts at:

  1. 3 MIU.                                                             
  2. 4 MIU.
  3. 5 MIU.                                                            
  4. 6 MIU.

 

 

 

 

 

 

 

The answer is: A

 

6- TMJ Condyle is:

  1. Strongly convex in the antroposterior direction & slightly convex mediolaterally.
  2. Strongly convex in the mediolateral direction & slightly convex antroposteriorly. 
  3. Concavo-convex.
  4. Concave in the antroposterior direction & convex in the mediolateral direction.

 

 

 

 

 

 

 

The answer is: A

 

7-The secondary cartilage present in the head of the TMJ condyle remains active till:

  1. The end of the 3rd
  2. The beginning of the fourth decade.
  3. The end of the second decade.
  4. The beginning of the second decade.

 

 

 

 

 

 

 

 

The answer is: C

 

8- Glenoid fossa is:

  1. A depression on the inferior surface of the squamous part of the temporal bone.
  2. An elevation on the inferior surface of the squamous part of the temporal bone.
  3. A depression on the anterior surface of squamous part of the temporal bone.
  4. An elevation on the inferior surface of the zygomatic part of the temporal bone.

 

 

 

 

 

 

 

The answer is: A

 

9- The glenoid fossa is limited:

  1. Medially by the spine of sphenoid & laterally by the root of the zygomatic process of the temporal bone.
  2. Laterally by the spine of sphenoid & Medially by the root of the zygomatic process of the temporal bone.
  3. Medially by the root of the zygomatic process of the temporal bone & laterally by the spine of sphenoid.
  4. Medially by the spine of sphenoid & laterally by the squamous part of the temporal bone.

 

 

 

 

 

 

 

The answer is: A

 

10- TMJ articular eminence is:

  1. Present at birth.
  2. Absent at birth.
  3. Formed during birth.
  4. Present at childhood.

 

 

 

 

 

 

 

 

The answer is: B

 

11- TMJ disk is:

  1. Biconcave of uneven thickness.
  2. Concavo-convex of uneven thickness.
  3. Biconcave of even thickness.
  4. Concavo-convex of even thickness.

 

 

 

 

 

 

 

The answer is: A

 

12- One of the following is not  the exact function of TMJ ligament:

  1. Prevent lateral displacement of one joint & medial displacement of the other.
  2. Limit the amount of inferior displacement.
  3. Prevents posterior displacement.
  4. Restricts the TMJ displacement in all planes.

 

 

 

 

 

 

 

The answer is: D

 

13- The TMJ large marrow spaces:

  1. Remain unchanged.
  2. Increases by age.
  3. Decrease by age.
  4. Rich in collagen type l

 

 

 

 

 

 

 

The answer is: C

 

14- TMJ collagen fibers show alternating dark & light bands when viewed in polarized light which indicate that:

  1. They are wavy or crimped.
  2. They are straight.
  3. They are twisted.
  4. They are corrugated.

 

 

 

 

 

 

 

The answer is: A

 

15- Condylar cartilage cells:

  1. Increase in number with age.
  2. Decrease in number with age.
  3. Remain unchanged.
  4. Degenerate with age.

 

 

 

 

 

 

 

The answer is: A

 

16- The hyaline cartilage in the condyle serves as an active growth center till the age of:

  1. 30 years.                                                 
  2. 10 year.
  3. 20 years.                                                 
  4. 40 years.

 

 

 

 

 

 

 

 

The answer is: C

 

17- The periodicity of the crimping seen in TMJ collagen fibers is of the order of:

  1. 30-40 µm.                                                  
  2. 15-20 µm. 
  3. 10-25 mm.                                                
  4. 15-30 mm. 

 

 

 

 

 

 

 

The answer is: B

 

18- The ground substance of TMJ disk comprises about:

  1. 10% of its dry weight.                              
  2. 5% of its dry weight.
  3. 12% of its dry weight.                              
  4. 8% of its dry weight. 

 

 

 

 

 

 

 

The answer is: B

 

19- Which of the following statements about TMJ intr articular disk is true:

  1. About ⅔ of glygosaminoglycans is chondroitin sulphate & about ⅓ is dermatan sulfate.
  2. About ⅓ of glygosaminoglycans is chondroitin sulphate & about ⅔  is dermatan sulfate.
  3. About ⅛ of glygosaminoglycans is chondroitin sulphate & about ⅜  is dermatan sulfate.
  4. About ⅜ of glygosaminoglycans is chondroitin sulphate & about ⅛   is dermatan sulfate.

 

 

 

 

 

 

 

The answer is: A

 

20-The TMJ disk is:

  1. Avascular & not innervated in its central region.
  2. Vascular & innervated.
  3. Avascular & innervated.
  4. Vascular & not innervated.

 

 

 

 

 

 

 

 

The answer is: A

 

21- At rest the hydrostatic pressure of TMJ synovial fluid has been reported as being:

  1. Atmospheric                      
  2. Supratmospheric
  3. Suatmospheric 
  4. Sometimes suatmospheric & other times atmospheric

 

 

 

 

 

 

 

The answer is: C

 

22- Which one of the following is not a function of the TMJ synovial fluid:

  1. Lubricatiuon                                         
  2. Nourishment
  3. Debridement                                        
  4. Pressure dampening

 

 

 

 

 

 

 

The answer is: D

 

23- The vascular supply to the TMJ comes from:

  1. External carotid artery.
  2. Internal carotid artery.
  3. Common carotid artery.
  4. Both External & Internal carotid arteries. 

 

 

 

 

 

 

 

The answer is: A

 

 

24- The TMJ takes branches from:

  1. The mandibular division of the trigeminal nerve.
  2. The maxillary division of the trigeminal nerve.
  3. The ophthalmic division of the trigeminal nerve.
  4. The facial branch of the mandibular nerve.

 

 

 

 

 

 

The answer is: A