DEVELOPMENT OF THE TONGUE

Question 1

consists of the body and back

Answer 1

anterior 2/3 = body

posterior 1/3

Question 2

anterior and posterior of the tongue are separated by

Answer 2

v-shaped terminal sulcus

Question 3

the body of the tongue is formed by

Answer 3

formed from 3 dilatations derived from 1ts P arch, 2 lateral lingual swellings, and 1 median tuberculum impar

Question 4

the tuberculum impar do not grow much as lateral lingual swelling thus they fuse anteriorly to it

Answer 4

true

Question 5

the body is innervated by

Answer 5

mandibular branch of trigeminal neve

Question 6

posterior of the tongue

Answer 6

it is formed by copula which is a fusion of P arch 2,3,4 but the contribution of 2 arches is submerged by mesenchyme of 3 and 4

Question 7

In of posterior tongue

Answer 7

glossopharyngeal nerve and superior laryngeal nerve

Question 8

body of tongue- in addition to mandibular branch

Answer 8

there is an addition os special branch of the facial nerve, chorda tympani which is pretrematic branch of facial nerve

Question 9

muscles of the tongue

Answer 9

are derived from occipital myotomes which contribute to muscles of tongue and lips and comes from somites which branch to form dermatomes which form dermis of the skin and sclerotome which form ventral column a

Question 10

myotomes migrate from somites to

Answer 10

populate the tongue and they bring with them the hypoglossal nerve which innervates all the muscles of the tongue.

Question 11

Ankyloglossia (tongue-tie)

Answer 11

the tongue is tied down to the ventral surface of the oral cavity and the frenulum extends to the tip of the tongue

Question 12

Bifid/Cleft tongue (Glossoschisis)

Answer 12

cleft formed on the tongue due to failure of lateral lingual swelling to fuse

Question 13

macroglossia

Answer 13

enlarged tongue

Question 14

microglossia

Answer 14

small tongue

Question 15

aglossia

Answer 15

absence to tongue