5.2 Development of head & neck Flashcards
1
Q
what are pharyngeal clefts?
A
invaginations of ectoderm
2
Q
what facilitates palatal shelf fusion?
A
tongue dropping down
3
Q
which auricular hillocks form:
-first pharyngeal arch
-second
A
-1,2,3
-3,4,5
4
Q
which nerves provide general sensation to areas of tongue?
A
ant 2/3: trigeminal
post 1/3: glossopharyngeal
5
Q
which nerves provide taste to areas of tongue?
A
ant 2/3: facial
post 1/3: glossopharyngeal
6
Q
where do tongue muscles arise from?
A
occipital somites which migrate anteriorly at level of hypoglossal nerve
7
Q
how does thyroglossal duct form?
A
diverticulum grows down with foramen caecum between ant 2/3 and post 1/3 tongue
8
Q
failure of thyroglossal duct to break down fully could result in?
A
cyst- isolated, band broken down
fistulae- thyroglossal duct remains
