Head & Neck II Flashcards Preview

Term I: Embryology > Head & Neck II > Flashcards

Flashcards in Head & Neck II Deck (20):
1

Origin of mouth

Stomodeum

2

Origin of eyes

Optic placodes

3

Origin of external auditory canal

1st pharyngeal cleft

4

Origin of tympanic cavity

1st pharyngeal pouch

5

Origin of malleus and incus

1st pharyngeal arch

6

Origin of stapes

2nd pharyngeal arch

7

What forms the three layers of the tympanic membrane?

Ectoderm - 1st branchial cleft
Mesoderm - fibrous stratum
Endoderm - 1st branchial pouch

8

Origin of inner ear

Otic placode (ventral - auditory, dorsal - vestibular)

9

Origin of nose

Nasal placodes

10

Origin of upper lip

Medial nasal prominences (philtrum) and maxillary prominence

11

Origin of palate

Palatine shelves

12

Origin of anterior 2/3 of tongue

1st pharyngeal arch

13

Origin of midline swelling (copula) of tongue

2nd pharyngeal arch

14

Origin of posterior 1/3 of tongue

3rd and 4th pharyngeal arches

15

Origin of thyroid

Endodermal diverticulum at foramen cecum

16

How many adult teeth are there? How many baby teeth?

32 adult, 20 baby

17

Origin of skull

Neural crest - almost all of it

18

When does the posterior fontanelle close? The anterior one?

Posterior - by 3 months
Anterior - by 18 months

19

What is it called if the fetal skull bones close too early?

Craniosynostosis

20

Which suture is most commonly affected in craniosynostosis?

Sagittal