M., Vessels & N. of Thoracic, Abdominal Wall, & Breast

Question 1

Name the intercostal muscles.

Answer 1

1. External intercostal m.
2. Internal intercostal m.
3. Innermost intercostal m.

Question 2

External Intercostal m origin, insertion and nerve innervation?

Answer 2

O: Inferior border of rib above
I: Superior border of fib below
N: Intercostal n. (T1-T11)

Question 3

Function of external intercostal m?

Answer 3

Moves ribs superiorly during inspiration.

Question 4

Direction of muscle fibers for external intercostal m?

Answer 4

Medial & Inferiorly

Question 5

Internal Intercostal m origin, insertion and nerve innervation?

Answer 5

O: Superior border of rib below
I: Inferior border of rib above
N: Intercostal n. (T1-T11)

Question 6

Function of internal intercostal m?

Answer 6

Moves rib inferiorly during expiration.

Question 7

What arteries supply the thoracic wall?

Answer 7

1. Posterior intercostal a. (brand of thoracic a)
2. Anterior intercostal a.
   (branch of internal thoracic a.)

Question 8

What veins drain the thoracic wall?

Answer 8

1. Posterior intercostal v. —>
   R side = azygos v
   L side = hemiazygos/ accessory zygote v.
2. Anterior intercostal v. —> directly/ indirectly into internal thoracic v —> R & L brachiocephalic v

Question 9

What nerves innervates the thoracic wall (intercostal m, skin of chest wall, & parietal pleura?

Answer 9

1. anterior rami of upper thoracic spinal n (intercostal n. T1-T11)
2. Anterior ramus of spinal n (subcostal n. T12)

Question 10

Where does the diaphragm attach?

Answer 10

1. xiploid process
2. costal margin
3. end of ribs 11 & 12
4. Lumbar vertebra (L1-L3)
   —-> converge to form central tendon

Question 11

What are the 3 foramina in the diaphragm?

Answer 11

1. Aortic Hiatus: T12 level
2. Esophageal hiatus: T10 level
3. Caval opening: T8 level

Question 12

What nerve innervates the diaphragm?

Answer 12

R & L phrenic nerves (C3,C4,C5)

C3, C4, C5 keeps the diaphragm alive

Question 13

Function of diaphragm?

Answer 13

Depresses dome (moves inferiorly)
- thus, increases volume to thoracic cavity to decrease P during inspiration

Question 14

What 3 arteries supply the mammary gland?

Answer 14

1. Axillary a.
2. Internal thoracic a.
3. Intercostal a. (2-4)

Question 15

What veins drain the mammary gland?

Answer 15

1. Axillary v.
2. Internal thoracic v.
3. Intercostal v.

Question 16

What nerve innervates the mammary gland?

Answer 16

intercostal n. (2-6)

Question 17

What nerve innervates the nipple?

Answer 17

4th intercostal n.

Question 18

What is the lymphatic drainage of the mammary gland?

Answer 18

1. Axillary nodes (75%) -lateral
2. Parasternal lymph nodes

Question 19

What nerves supply the anterior abdominal wall?

Answer 19

1. internal intercostal n. supply skin, muscle & parietal peritoneum (T7-T12)
2. Thoracoabdominal n. (T7-T11)
3. Lateral cutaneous branch of subcostal n. (T12)

Question 20

What arteries and veins supply the anterior abdominal wall?

Answer 20

Arteries:
1. superior epigastric a. (internal thoracic a.)
2. inferior epigastric a. (external thoracic a.)
3. branches of intercostal a.

Veins:
parallel to ones above