vasculature of thoracic wall

Question 1

location of Internal thoracic a.

Answer 1

• on inner surface of A. thoracic wall (both sides of sternum)
• S. b/w pleura and internal intercostal m
• I. b/w internal intercostal m and transversus thoracic m

Question 2

Internal thoracic a. branches from?

Answer 2

Subclavian a. in root of neck

Question 3

Internal thoracic a. bifurcates where? Into what?

Answer 3

Bifurcates in 6th intercostal space, into S. Epigastric & Musculophrenic As

Question 4

1st - 6th pair of A. Intercostal a.’s branch from?

Answer 4

the Internal Thoracic a

• main branch is on I. surface of rib in costal groove (VAN)
• collateral branch is on S. surface of next adjacent I. rib

Question 5

7th - 9th pair of A. Intercostal a’s branch from?

Answer 5

Musculophrenic a.

Question 6

A. Intercostal a. distribution?

Answer 6

A. intercostal tissues and overlying dermatomal tissues

Question 7

A. intercostal v.

Answer 7

will accompany and drain to corresponding vv.’s

Question 8

1st - 2nd pair of P. Intercostal aa.’s branch from?

Answer 8

S. Intercostal a which branches from Costocervical Trunk

Question 9

3rd - 11th pair (as well as subcostal a.) branch from?

Answer 9

directly from Descending Thoracic Aorta

Question 10

3rd - 11th Intercostal a. branch types

Answer 10

Main: I. surface rib (with intercostal n. b/w internal and innermost intercostal mm) (anastomose w/ A. intercostal a.)
Collateral: S. surface of adj. rib
Dorsal: supplies VC, mm, skin

Question 11

P. intercostal a. distribution

Answer 11

posterolateral intercostal t. + overlying dermatomal t.

Question 12

P. intercostal vv.’s

Answer 12

will accompany and drain to azygos system of vv.’s