Branchial Pouch Derivatives

Question 1

What are the derivatives of the first pouch?

Answer 1

Middle ear cavity, eustachian tube, mastoid air cells

Question 2

What are the derivatives of the 2nd pouch?

Answer 2

Epithelial lining of palatine tonsil

Question 3

What are the derivatives of the 3rd pouch?

Answer 3

Dorsal wings-> inferior parathyroids

Ventral Wings-> thymus

Question 4

What are the derivatives of the 4th pouch?

Answer 4

Dorsal wings -> superior parathyroids
Ventral Wings-> ultimobranchial body -(fuses with the thyroid gland)
Ventral Wings -> Parafollicular (C) cells of thyroid