Week 4 - Embryology of the Face

Question 1

What is each arch if the Pharyngeal Apparatus made of?

Answer 1

Ectoderm, Mesoderm & Neural Crest Cells, Endoderm

Question 2

What is each Cleft/Groove of the Pharyngeal Apparatus made of?

Answer 2

Ectoderm

Question 3

What is each Pouch of the Pharyngeal Apparatus made of?

Answer 3

Endoderm

Question 4

What arches lead to the tongue?

Answer 4

Question 5

What does the first arch do in relation to the tongue?

Answer 5

1st arch takes over the tuberculum impar to form the anterior 2/3 of the tongue

Question 6

Which nerve/s supplies sensory innervation to the anterior 2/3 of the tongue?

Answer 6

Trigeminal and Facial

Question 7

What arch is the posterior 1/3 of the tongue derived from?

Answer 7

3rd Arch

Question 8

What arch is the epiglottis and extreme posterior part of the tongue derived from?

Answer 8

4th Arch

Question 9

Tongue development from week 6 to adult visualised

Answer 9

Question 10

What thing divides the anterior 2/3 of the tongue and the posterior 1/3?

Answer 10

Foramen cecum and Terminal Sulcus

Question 11

What provides sensory innervation to posterior 1/3 of tongue?

Answer 11

Glossopharyngeal

Question 12

Sensory Innervation of tongue summarised

Answer 12

Question 13

What branch of Trigeminal provides general sensation of ant 2/3 of tongue?

Answer 13

Lingual nerve

Question 14

What provides special sensation of ant 2/3 of tongue?

Answer 14

Chordatympani (branch of facial nerve)

Question 15

What innervates the tongue musculature? and why?

Answer 15

Cranial nerve 12 -> they come from the postotic somites from behind the ear$$

Question 16

How do the occipital somites migrate?

Answer 16

Migrate downward, forward and upward into the floor of the oral cavity giving rise to intrinsic muscles of tongue and their innervation

Question 17

What cranial nerves contribute to the tongue?

Answer 17

CN5, CN7, CN9, CN10, CN12