Embryo

Question 1

1st Pharyngeal Pouch

Answer 1

• epithelium of middle ear and auditory tube
• tympanic membrane
• epithelium of external ear

Question 2

2nd Pharyngeal Pouch

Answer 2

-epithelium of palatine tonsil crypts

Question 3

3rd Pharyngeal Pouch

Answer 3

-Thymus, inferior parathyroid glands

Question 4

4th Pharyngeal Pouch

Answer 4

-superior parathyroid glands, ultimobranchial body

Question 5

1st Aortic Arch

Answer 5

• part of maxillary artery

- 1st arch is maximal

Question 6

2nd Aortic Arch

Answer 6

• stapedial and hyoid artery

- second is stapedial

Question 7

3rd Aortic Arch

Answer 7

• Common carotid artery and part of internal carotid artery

- C is 3rd letter of alphabet

Question 8

4th Aortic Arch

Answer 8

• on left, aortic arch, on right, proximal part of R subclavian artery
• 4th arch for 4 limbs (think systemic)

Question 9

6th Aortic Arch

Answer 9

-proximal part of pulm arteries and ductus arteriosis

Question 10

Branchial Cleft Cyst

Answer 10

• congenital epithelial cyst on lateral neck due to failure of obliteration of the second branchial cleft
• usually asymptomatic but may become infected
• located anterior to the sternocleidomastoid muscle