Embryology

Question 1

Derivates of the 4 pharyngeal pouches

Answer 1

1st - middle ear cavity, auditory tube

2nd- palatine tonsils, tonsillar fossa

3rd- inferior parathyroid gland,

4th- parafollicular cells of thyroid gland and superior parathyroid gland

Question 2

derivatives of 4 pharyngeal clefts

Answer 2

1 - external auditory meatus
epithelium of the eardrum

2,3,4 - cervial sinus

Question 3

development of the stomach

Answer 3

rotates 90 degrees in clockwise direction around longitudinal axis