Week 8 - musculocutaneous nerve

Question 1

Musculocutaneous nerve course (C5-7)

Answer 1

Arises from cord of brachial plexus
Pierces coracobrachialis and descends laterally between biceps brachii and brachialis at the lateral arm

Pierces the deep fascia in the cubital fossa lateral to the tendon of biceps brachii

Continues as the lateral cutaneous nerve of the forearm

Question 2

Musculocutaneous motor and sensory supply

Answer 2

• Motor supply:
  – biceps brachii
  – brachialis
  – coracobrachialis
• Sensory supply:
  – lateral cutaneous nerve of the forearm

Question 3

Median, ulnar nerve path and axillary artery becomes which artery and when?

Answer 3

The median and ulnar nerves run medially with the brachial artery in the arm.
The axillary artery becomes the brachial artery at the inferior border of the teres major