Branchial pouch derivatives Flashcards
1
Q
1st pouch
A
Middle ear cavity, eustachian
tube, mastoid air cells
1st pouch contributes to
endoderm-lined structures of
ear
Ear, tonsils, bottom-to-top: 1 (ear) 2 (tonsils) 3 dorsal (bottom for inferior parathyroids) 3 ventral (to = thymus) 4 (top = superior parathyroids)
2
Q
2nd pouch
A
Epithelial lining of *palatine
tonsil
Ear, tonsils, bottom-to-top: 1 (ear) 2 (tonsils) 3 dorsal (bottom for inferior parathyroids) 3 ventral (to = thymus) 4 (top = superior parathyroids)
3
Q
3rd pouch
A
*Dorsal wings - *inferior
parathyroids.
*Ventral wings - *thymus
3rd pouch contributes to 3
structures (thymus, left and
right inferior parathyroids)
3rd-pouch structures end up
below 4th-pouch structures
Ear, tonsils, bottom-to-top: 1 (ear) 2 (tonsils) 3 dorsal (bottom for inferior parathyroids) 3 ventral (to = thymus) 4 (top = superior parathyroids)
4
Q
4th pouch
A
*Dorsal wings - *superior parathyroids *Ventral wings: -ultimobranchial body -parafollicular (C) cells of thyroid
Ear, tonsils, bottom-to-top: 1 (ear) 2 (tonsils) 3 dorsal (bottom for inferior parathyroids) 3 ventral (to = thymus) 4 (top = superior parathyroids)
