MCQs in Oral Histology

Chapter 2: Embryology

 

 

1-WHICH OF THE FOLLOWING IS NOT A CORRECT PAIRING OF EMBRYONIC STRUCTURE AND ADULT DERIVATIVE:

  1. Maxillary processes: secondary palate.
  2. Primary palate: upper incisor teeth.
  3. Second pharyngeal arch: mandible.
  4. Lateral lingual swellings: anterior 2/3 of tongue.

 

 

 

 

 

 

 

The answer is: C

 

2-Which of the following are all derived from the stomodeal ectoderm:

  1. Salivary glands, anterior pituitary gland and enamel organs.
  2. Enamel dentin and major salivary glands.
  3. Cementum, anterior pituitary gland and stratum intermedium.
  4. Dental lamina, dental papilla and dental sac.

 

 

 

 

 

 

 

The answer is: A

 

3- Which of the following does contribute to the formation of the upper lip:

  1. Lateral nasal process.
  2. Two maxillary processes & medial nasal process.
  3. Medial nasal process.
  4. First branchial arch.

 

 

 

 

 

 

 

The answer is: B

 

4- The palatal shelves (palatine processes):

  1. Are covered by endoderm.
  2. Are derived from the primary palate.
  3. Must assume a vertical position for palate closure to occur.
  4. Are derived from the first branchial arch.

 

 

 

 

 

 

The answer is: D

 

5- An oblique facial cleft is formed:

  1. Due to the rupture of the buccopharyngeal membrane.
  2. When the maxillary process fails to fuse with the mandibular processes.
  3. When the maxillary process fails to fuse with the lateral & medial nasal  process.
  4. When the medial nasal process fails to fuse with the maxillary process. 

 

 

 

 

 

 

The answer is: C

 

6- The extrinsic muscles of the tongue:

  1. Develop from the maxillary process.
  2. Develop from occipital myotomes.
  3. Develop from tuberculum impar.
  4. Develop from the second branchial arch.

 

 

 

 

 

 

 

 The answer is: B

 

7- Which of the following embryonic structures contribute to the formation of lower lip:

  1. Maxillary process.
  2. Maxillary & medial nasal processes.
  3. Medial & lateral nasal processes.
  4. Two mandibular processes.

 

 

 

 

 

 

 

The answer is: D

 

8- The tongue is not derived from:

  1. Two lingual swellings.
  2. Second branchial arch.
  3. Third branchial arch.
  4. Copula of His.

 

 

 

 

 

 

The answer is: B

 

9- Palatine processes are derived from:

  1. Maxillary processes.
  2. Mandibular processes.
  3. Copula of His.
  4. Medial nasal process.

 

 

 

 

 

 

The answer is: A

 

10- The maxillary processes:

  1. Are covered with endoderm.
  2. Are derived from the 1stbranchial arch.
  3. Form the primary palate.
  4. Form the entire upper lip.

 

 

 

 

 

 

 

The answer is: B

 

11- A unilateral cleft lip is formed when:

  1. The palatal shelves remain in a vertical position.
  2. The bucco-nasal membrane ruptures.
  3. One maxillary process fails to fuse with the medial nasal process.
  4. One lateral nasal process fails to fuse with the maxillary process.

 

 

 

 

 

 

The answer is: C

 

12- The soft palate develops from:

  1. Primary palate.
  2. Palatal processes fused with the nasal septum.
  3. Medial nasal process.
  4. Palatal processes which are not fused with nasal septum.

 

 

 

 

 

 

 

The answer is: D

 

13-Branchial archs sharing in tongue development are:

  1. First & second.
  2. First.
  3. Second & third.
  4. First, third & fourth.

 

 

 

 

 

 

 

 The answer is: D

 

14- The Stomodeum is lined by:

  1. Endoderm
  2. Mesoderm
  3. Ectoderm
  4. Endoderm & Mesoderm

 

 

 

 

 

 

The answer is: C

 

15- The palatal shelves:

  1. Develop from the lateral nasal processes.
  2. From the primary palate.
  3. Develop from the medial nasal processes.
  4. Develop from the maxillary processes.

 

 

 

 

 

 

 

The answer is: D

 

16- The ossification center of the developing mandible arise between:

  1. inferior dental and lingual nerves.
  2. mental and incisive nerves
  3. mandibular and maxillary nerves.
  4. superior alveolar and infrorbital nerves.

 

 

 

 

 

 

 

The answer is: B

 

17-The extrinsic muscles of the tongue are supplied by:

  1. trigeminal nerve.
  2. hypoglossal nerve.
  3. facial nerve.
  4. lingual nerve.

 

 

 

 

 

 

 

The answer is: B

 

18- Secondary palate is developed from the :

  1. 1stbranchial arch .                                    
  2. 2ndbranchial arch.
  3. 3rdbranchial arch.                                          
  4. fronto-nasal process.

 

 

 

 

 

 

 

The answer is: A

 

19-The muscles of mastication are derived from:

  1. occipital myotomes.                                       
  2. 3rdbranchial arch.
  3. 1stbranchial arch.                                           
  4. 2ndbranchial arch.

 

 

 

 

 

 

 

The answer is: C

 

20- palatine processes are derived from:

  1. fronto- nasal process.                                    
  2. lateral nasal process.
  3. 3rdbranchial arch.                                          
  4. maxillary processes.

 

 

 

 

 

 

 

The answer is: D

 

 

21- Tongue begins to develop at:

  1. 6thi.u.                   
  2. 11thi.u.                 
  3. 4thi.u.      
  4. 8thi.u.

 

 

 

 

 

 

 

The answer is: C

 

22- Ossification center of maxilla arises between:

  1. maxillary and mandibular nerves.
  2. anterior superior alveolar nerve and infraorbital nerve.
  3. posterior and middle superior alveolar nerves.
  4. inferior alveolar and lingual nerves.

 

 

 

 

 

 

 

The answer is: B

 

23- First branchial arch is supplied by:

  1. facial nerve.
  2. glossopharyngeal nerve.
  3. hypoglossal nerve.
  4. mandibular nerve.

 

 

 

 

 

 

The answer is: D

 

24-The neural crest cells give rise to:

  1. Bone, dentine and cartilage.
  2. Enamel, dentine and bone.
  3. Sensory cells, enamel and dentine.
  4. Fibroblasts, pericytes and enamel.

 

 

 

 

 

 

 

The answer is: A

 

25- Which of the following are derived from Meckel's cartilage:

  1. Mental ossicles, incus and malleous of the middle ear.
  2. Lingula of the mandible and middle ear.
  3. stylo-mandibular ligament.
  4. All of the above.

 

 

 

 

 

 

 

The answer is: A

 

26-The inferior parathyroid gland originates from:

  1. First pharyngeal pouch.
  2. First pharyngeal cleft.
  3. Third pharyngeal pouch.
  4. Fourth pharyngeal pouch.

 

 

 

 

 

 

 

The answer is: C

 

27- The development of secondary palate begins from:

  1. 3-4 W.I.U.
  2. 4 -5 W.I.U.
  3. 15-16 W.I.U.
  4. 6-9 W.I.U.

 

 

 

 

 

 

The answer is: D

 

28- The occipital somites myotomes give rise to:

  1. Muscles of mastication         
  2. Muscles of the lip.
  3. Muscles of the tongue.
  4. Muscles of cheek.

 

 

 

 

 

 

 

The answer is: C

 

29- The malleus of inner ear originates from:

  1. Condylar cartilage.         
  2. Coronoid cartilage.
  3. Meckel’s cartilage.       
  4. None of the above.

 

 

 

 

 

 

 

The answer is: C