Dissecion 2: Axilla and Brachial Plexus

Question 1

Which muscle makes up the anterior wall of the axilla

Answer 1

pectoralis major

Question 2

What is the main muscle of the posterior wall of the axilla

Answer 2

latissimus dorsi (teres major also contributes)

Question 3

Where does the axillary vein become the subclavian

Answer 3

at the lateral border of rib 1

Question 4

Where is the axillary vein renamed the brachial vein

Answer 4

at the lower border of teres major

Question 5

What forms the brachial plexus

Answer 5

the anterior rami of spinal nerves C5-T1

Question 6

From proximal to distal what does the brachial plexus consist of

Answer 6

Roots
Trunks
Divisions
Cords
Branches (named nerves)

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Question 7

What muscles are supplies by the musculocutaneous nerve

Answer 7

coracobrachialis, biceps brachii and brachialis (anterior compartment)

Question 8

Which compartment contains the axillary and radial nerves

Answer 8

posterior compartment of the arm

Question 9

In what injury is the axillary nerve vunerable

Answer 9

shoulder dislocation or fractured neck of humerous

Question 10

When could the radial nerve be damages

Answer 10

mid shaft humeorus fracture

Question 11

Where does the ulner nerve enter the arm

Answer 11

it is the most medial of the brachial plexus and passes posteriolory into the medial aspect of the arm

Question 12

What does the median nerve form

Answer 12

the ‘M’ shape configuration of the named nerves in the axilla