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