Development of tongue

Question 1

a median triangular
elevation appears in the floor of the primordial pharynx
just rostral to the foramen cecum at what week

Answer 1

At the end of the fourth week

Question 2

What is the name of this elevation

Answer 2

median lingual swelling or tongue bud or tuberculum impar

Question 3

two lateral
lingual swellings develop on each side of

Answer 3

the median lingual swelling.

Question 4

The lateral lingual swelling is also known as

Answer 4

distal tongue buds

Question 5

Where does the 3 swellings arise from

Answer 5

the proliferation of mesenchyme in ventromedial parts of the first pair of pharyngeal arches

Question 6

The two lateral lingual swellings overgrow the
medial lingual swelling and merge with each other to form

Answer 6

anterior two-third of the tongue
or oral part

Question 7

The line of fusion
of two lingual swellings in the median plane form

Answer 7

median sulcus on the dorsal surface of the tongue.

Question 8

What does the tubercular impar form

Answer 8

does not form any recognizable part of the adult tongue.

Question 9

The
fusion site of the swellings is indicated by

Answer 9

the midline
groove/median sulcus and internally by the fibrous lingual septum.

Question 10

anterior
two-third of the tongue develops from

Answer 10

1st pharyngeal arch

Question 11

mucus membrane and taste buds of anterior two-third of the tongue is innervated by

Answer 11

lingual division of mandibular branch of
trigeminal nerve

chorda tympani branch of facial nerve.

Question 12

The posterior one-third of the tongue develops from

Answer 12

cranial part of
hypobranchial eminence.

Question 13

The copula forms by fusion of

Answer 13

the ventromedial parts of the second pair of pharyngeal arches.

Question 13

The hypopharyngeal eminence develops caudal to the

Answer 13

copula from mesenchyme in the ventromedial parts of the
third and fourth pairs of pharyngeal arches.

Question 14

posterior one-third of tongue develops from

Answer 14

3rd pharyngeal arch

Question 14

The line of fusion of the anterior two-third and posterior one-third of the tongue is indicated by

Answer 14

a V-shaped
groove—the sulcus terminalis

Question 15

mucus membrane and taste buds of posterior one-third of tongue is innervated by

Answer 15

glossopharyngeal nerve

Question 16

What nerve accompanies the myoblasts during their migration and innervates the tongue muscles as they develop

Answer 16

hypoglossal nerve

Question 16

The muscles of tongue develop from

Answer 16

myoblasts that migrate into developing tongue from the 2nd to 5th occipital myotomes

Question 17

Lingual papillae appear toward the end of

Answer 17

the eighth
week

Question 18

Which papillae appear first

Answer 18

circumvallate and foliate papillae

Question 19

circumvallate and foliate papillae lie where

Answer 19

lie close to terminal branches of the glossopharyngeal nerve

Question 20

Why is the 2nd arch not involved with development of tongue

Answer 20

There is overgrowth of third arch over the second arch, so the second arch is buried under third arch.

Question 21

The fungiform papillae appear later near

Answer 21

terminations of the chorda tympani branch of the facial
nerve

Question 22

Circumvallate papillae forms from

Answer 22

cranial part of hypopharyngeal eminence

Question 23

Filiform papillae develop when

Answer 23

10th to 11th week

Question 24

Filiform papillae contain

Answer 24

afferent nerve endings that are sensitive
to touch.

Question 25

Taste buds develop during

Answer 25

weeks 11 to 13

Question 26

Taste buds develop

Answer 26

in relation to the terminal
branches of nerves carrying taste sensations (chorda tympani, glossopharyngeal, and vagus nerves)

Question 27

Clinical correlates

Answer 27

Aglossia (absence of tongue): It is very rare and occurs due to complete agenesis of tongue primordia.

Hemiglossia (half tongue): It occurs if one of the lingual
swelling fails to develop.

Microglossia: Tongue is too small.

Macroglossia: Tongue is too large.

Tongue tie (ankyloglossia): It occurs when frenulum of tongue extends to the tip of the tongue, thus preventing its protrusion and causing difficulty in speech

Question 28

Mucous membrane and taste buds of the posterior most part of the tongue is innervated by

Answer 28

Superior laryngeal nerve

Question 29

What separates the developing tongue from the floor of the mouth

Answer 29

linguogingival
sulcus

Question 30

Hypopharyngeal eminence overgrows what

Answer 30

Copula