03 Oral Cavity and Oropharynx Anatomy

Question 1

Embryologic origin of anterior 2/3 and posterior 1/3 of tongue

Answer 1

Ant 2/3: 1st branchial arch
Post 1/3: 3rd and 4th branchial arches
Boundary marked by foramen cecum

Question 2

when does primary palate develop? secondary palate?

Answer 2

1: 4-5 wks
2: 8-9 wks

Question 3

what divides the palate into primary and secondary

Answer 3

incisive foramen

Question 4

what artery goes through incisive foramen

Answer 4

lesser palatine artery

Question 5

What are the extrinsic tongue muscles

Answer 5

Genioglossus
Hyoglossus
Styloglossus
Palatoglossus (CN X)

Question 6

Which group of papillae on the tongue lack taste buds

Answer 6

Filiform

Question 7

What nerve carries taste from posterior 1/3

Answer 7

lingual (CN IX)

Question 8

taste fibers terminate in

Answer 8

nucleus tractus solitarius

Question 9

T/F. The four taste qualities can be perceived by all the taste buds

Answer 9

True

Question 10

How long do taste sensory cells live

Answer 10

200-300 hours

Question 11

At what age can infant suckle feed

Answer 11

34 wks gestation

Question 12

What is Gerlach’s tonsil

Answer 12

Lymphoid tissue arising from fossa of Rosenmuller that extends into Eustachian tube

Question 13

Plica triangularis

Answer 13

point at which the palatine and lingual tonsils meet (where you stop the tonsillectomy)