Neurovasculature Stuctures of Thoracic Wall

Question 0

Where do the first 6 intercostal aa branch from

Answer 0

internal thoracic artery

Question 1

Where do the VAN lie

Answer 1

partially under he cover of the costal groove of the upper rib

Question 2

Where do the lower intercostal aa (7-9) branch from

Answer 2

musculophrenic a

Question 3

Which direction does the main branch of the intercostal aa travel and which direction does the collateral branch travel

Answer 3

Main: inferior surface of rib in costal groove
Collateral: superior surface of next adjacent inferior rib

Question 4

Where do the 1st and 2nd posterior intercostal aa branch from

Answer 4

superior intercostal a

Question 5

Where do the lower posterior intercostal aa branch from

Answer 5

directly from descending thoracic aorta

Question 6

What is supplied by the dorsal branch of the posterior intercostal aa

Answer 6

vertebral column, back musculature, skin

Question 7

Where do the anterior intercostal vv drain to

Answer 7

forward to musculophrenic vv or internal thoracic vv

Question 8

Where do the posterior intercostal drain to

Answer 8

drain backward to the azygos system of vv

Question 9

What does the internal thoracic artery branch from

Answer 9

subclavian artery

Question 10

What are the branches of the internal thoracic artery

Answer 10

pericardiophrenic a

anterior intercostal aa

Question 11

What level does the internal thoracic artery terminate at and what does it terminate as

Answer 11

Terminates at 6th intercostal space
musculophrenic a
superior epigastric a

Question 12

What parts of the body drain to the azygos system of veins

Answer 12

back
thoracoabdominal walls
mediastinal viscera

Question 13

What is different about the azygos system

Answer 13

the veins are valveless

Question 14

What vertebral level does the azygos v span

Answer 14

T4-T12

Question 15

Where does the azygos vein drain to

Answer 15

superior vena cava

Question 16

What vessels does the azygos vein receive blood from

Answer 16

4th-11th posterior intercostal vv on RIGHT side

Question 17

Where is the Hemiazygos vein located

Answer 17

posterior mediastinum of left side from T9-T12

Question 18

How does the hemiazygos vein drain

Answer 18

Crosses over at T9 and drains into the azygos

Question 19

What vessels drain into the hemiazygos vein

Answer 19

9th-11th posterior intercostal vv on left side

Question 20

Where is the accessory hemiazygos vein located

Answer 20

posterior mediastinum of left side from T5-T8

Question 21

How does the accessory hemiazygos vein drain

Answer 21

Crosses over at T8 and drains into the azygos vein

Question 22

Where does the accessory azygos vein receive blood from

Answer 22

4th-8th posterior intercostal vv

Question 23

How is the superior intercostal vv formed

Answer 23

1st-3rd posterior intercostal vv

Question 24

Which sides of superior intercostal vv drain where

Answer 24

Right: drains to azygos v
Left: drains to either accessory hemiazygos or left brachiocephalic v

Question 25

What makes up the intercostal nerves

Answer 25

VPR of T1-T11

Question 26

What does the VPR of T12 form

Answer 26

subcostal nerve

Question 27

What does the collateral branch of intercostal nerves supply

Answer 27

intercostal mm and parietal pleura

Question 28

What is supplied by the lateral cutaneous branch of intercostal mm

Answer 28

skin of lateral thorax

Question 29

What is supplied by the anterior cutaneous branch of the intercostal nerve

Answer 29

skin of anterior thorax

Question 30

What is supplied by the muscular branch of the intercostal n

Answer 30

motor to the intrinsic mm of thoracic wall

Question 31

What number intercostal nerves are the thoracoabdominal nn

Answer 31

7th-11th intercostal nn

Question 32

What number intercostal nn are considered Typical intercostal nn.

Answer 32

3rd-6th