Axilla and Brachial Plexus

Question 1

What muscles makes up the anterior wall of the axilla?

Answer 1

Pectoralis major

Question 2

What muscles makes up the posterior wall of the axilla?

Answer 2

Teres major

Question 3

What vein does the axillary vein arise from? And where does this occur?

Answer 3

Brachial vein

At lower border of teres major

Question 4

What artery does the axillary artery arise from? And where does this occur?

Answer 4

Subclavian artery

At lateral border of first rib

Question 5

What is the brachial plexus?

Answer 5

A collection of spinal nerves that form the peripheral nerves of the upper limb

Question 6

What spinal nerves make up the brachial plexus?

Answer 6

Anterior rami of C5-C8, T1

Question 7

LOOK OVER BRACHIAL PLEXUS DIAGRAM

Answer 7

LOOK OVER BRACHIAL PLEXUS DIAGRAM

Question 8

What are the named nerves of the brachial plexus?

Answer 8

Musculocutaneous 
Radial
Axillary
Ulnar 
Median

Question 9

What muscles does the musculocutaneous nerve supply?

Answer 9

Coracobrachialis
Biceps brachii
Brachialis

Question 10

What nerve is vulnerable to injury in shoulder dislocation or fractured neck of humerus? And why?

Answer 10

Axillary nerve

Because it wraps around the posterior aspect of the surgical neck of the humerus

Question 11

What nerve is vulnerable to injury in a fracture of the mid-shaft of the humerus?

Answer 11

Radial nerve

Question 12

What is the most medial nerve?

Answer 12

Ulnar nerve

Question 13

What nerve makes up the middle of the M shape?

Answer 13

Median nerve