Aortic arches

Question 1

General embryonic arterial circ

Answer 1

initially bilateral and symmetric
* Multiple pairs of aortic arc vessels connected to paired dorsal aortae
* Truncus arteriosus will form the proximal ascending Ao + MPA
* Aortic sac (distal truncus) will form distal ascending aorta, brachiocephalic artery and aortic arch

Question 2

Ao arches that atrophies

Answer 2

1st
2nd
5th

Question 3

1st and 2nd Ao arch

Answer 3

Atrophy
Maxillary A and stapedial A

Question 4

3rd Ao arch

Answer 4

Common carotid As
Prox internal carotids

3rd letter of alphabet is C for carotid

Question 5

4thAo arch

Answer 5

R => proximal subclavian
L => Ao arch

Question 6

6th Ao arch

Answer 6

R = prox RPA
L = PDA and prox LPA

Question 7

R dorsal Ao

Answer 7

R subclavian a

Question 8

L dorsal Ao

Answer 8

distal Ao arch + desc Ao

Question 9

7th intersegmental

Answer 9

L subclavian

Question 10

Birds

Answer 10

Have R Ao arch

Question 11

Species differences in Ao arch

Answer 11

Eq and Bo: 1 BCT
Ca and Fe, Po, rabbits, mice: BCT + L subclavian
Hu and rat: BCT, L subclavian, R common carotid