Musculocutaneous nerve

Question 1

Course of musculocutaneous nerve

Answer 1

Arises from lateral cord and leaves axilla
Pierces coracobrachialis near point of insertion (humerus at level of deltoid tuberosity)
Passes down arm anterior to brachialis and posterior to biceps brachii
Emerges laterally to biceps tendon

Question 2

Termination of musculocutaneous nerve

Answer 2

Emerges laterally to biceps tendon and continues into forearm as lateral cutaneous nerve of forearm

Question 3

Function of musculocutaneous nerve

Answer 3

Motor Innervation to biceps brachii, brachialis, coracobrachialis

Question 4

Function/course of lateral cutaneous nerve of forearm

Answer 4

Pierces deep fascia to become subcutaneous (in close proximity to Cephalic vein)
Sensory Innervation to lateral forearm

Question 5

How is musculocutaneous nerve damaged

Answer 5

Stab wound to axilla region

Question 6

Consequence of damaged musculocutaneous nerve

Answer 6

Flexion at shoulder weakened
Flexion at elbow weakened
Supination of forearm greatly weakened
Loss of sensation over lateral forearm

Question 7

Spinal roots

Answer 7

C5-7