nerves of thoracic wall

Question 1

thoracic spinal nerves

Answer 1

12 pairs

Question 2

intercostal n

Answer 2

from ventral rami of T1-T11 SN

Question 3

subcostal n

Answer 3

from ventral ramus of T12 SN

Question 4

Dorsal rami of thoracic wall

Answer 4

pass P. to innervate vertebrae, joints, mm and skin

Question 5

collateral branch

Answer 5

• near angle of rib and pass along S. margin of lower rib

- innv. of intercostal mm and parietal pleura

Question 6

lateral cutaneous branch

Answer 6

• enters superficial fascia in midaxillary line

- sensory innv. of skin in lateral thoracic region

Question 7

anterior cutaneous branch

Answer 7

• enters superficial fascia in parasternal line

- sensory innv of skin in A. thoracic region

Question 8

muscular branch

Answer 8

motor innv. to intrinsic mm of thoracic wall

Question 9

rami communicants

Answer 9

-sympathetic connections b/w intercostal n and sympathetic trunk

Question 10

sympathetic innv. of thoracic wall

Answer 10

blood vessels, sweat glands and smooth m

Question 11

white ramus of thoracic wall

Answer 11

contain presynaptic fibers leaving n to enter ganglion

Question 12

gray ramus of thoracic wall

Answer 12

contain postsynaptic fibers leaving ganglion to enter n

Question 13

thoracoabdominal n

Answer 13

• 7th -11th intercostal nn

- cross costal margin from thorax to abdomen (innv. abdominal skin and mm)