Lecture 5

Question 1

1. What is the fate of the dorsal part of the 1st pharyngeal groove during development?
   a. Forms tonsillar sinus
   b. Develops into external auditory meatus
   c. Contributes to tonsillar crypts
   d. Migrates to form ultimobranchial body

Answer 1

Develops into external auditory meatus

Question 2

Which structure results from the fusion of the dorsal extremities of the 1st and 2nd pharyngeal arches?
a. Pinna
b. Tonsillar sinus
c. Tubotympanic recess
d. Auditory tube

Answer 2

Pinna

Question 3

What does the 2nd pharyngeal pouch primarily contribute to in development?
a. Tonsillar sinus
b. Thymus and inferior parathyroid glands
c. Mastoid antrum
d. Auditory tube

Answer 3

a. Tonsillar sinus

Question 4

Where do the inferior parathyroid glands originate during embryonic development?
a. Dorsal region of the 3rd pharyngeal pouch
b. Ventral region of the 3rd pharyngeal pouch
c. Dorsal region of the 4th pharyngeal pouch
d. Ventral region of the 4th pharyngeal pouch

Answer 4

Ventral region of the 3rd pharyngeal pouch

Question 5

At what week does the development of the superior parathyroid glands begin?
a. Week 5
b. Week 6
c. Week 7
d. Week 4

Answer 5

5

Question 6

What structure arises from the ultimobranchial body during development?
a. Tonsillar crypts
b. Parafollicular cells of the thyroid gland
c. Mastoid antrum
d. External auditory meatus

Answer 6

Parafollicular cells of the thyroid gland

Question 7

Which condition is associated with the persistence of external cervical (branchial) sinuses?
a. DiGeorge syndrome
b. Treacher-Collins syndrome
c. Goldenhar syndrome
d. Crouzon syndrome

Answer 7

DiGeorge

Question 8

What is the characteristic feature of DiGeorge syndrome?
a. Lack of parathyroid glands and thymus development
b. Macrognathism
c. Cyclopia
d. Lack of fusion of facial prominences

Answer 8

Lack of parathyroid glands and thymus development

Question 9

What is the primary cause of Aprosopia during facial development?
a. Deficient mesenchyme proliferation
b. Lack of fusion of maxillary prominence and medial nasal process
c. Lack of merging of medial nasal prominences
d. Total atresia of mandibular prominences

Answer 9

Deficient mesenchyme proliferation

Question 10

What is the result of incomplete fusion between maxillary prominence and lateral nasal process?
a. Median cleft lip
b. Cleft palate
c. Lateral cleft of the upper lip
d. Transverse facial cleft

Answer 10

Lateral cleft of the upper lip