18 Nerve (Musculocutaneous & Axillary)

Question 1

What is the source of the musculocutaneous nerve?

Answer 1

Lateral cord of the brachial plexus

C5-7

Question 2

What is the path of the musculocutaneous nerve in the arm?

Answer 2

leaves axilla

runs down and laterally to pierce coracobrachialis

passes distally between biceps and brachialis

Question 3

what is the path of the musculocutaneous nerve in the forearm?

Answer 3

emerges between biceps and brachialis

runs laterally to biceps tendon

pierces brachial fascia lateral to biceps tendon

passes superficially to cubital fossa

runs laterally down the forearm as the lateral cutaneous nerve of the forearm (anterior and posterior branch)

Question 4

what does the musculocutaneous nerve innervate?

Answer 4

the anterior compartment of the arm (biceps brachii, brachialis and coracobrachialis)

the lateral skin of the forearm (posterior and anterior)

Question 5

What is the source of the axillary nerve?

Answer 5

terminal branch of the posterior cord

C5-6

Question 6

what is the path of the axillary nerve?

Answer 6

located in quadrangular space in posterior shoulder (with posterior circumflex humeral artery)

winds around surgical neck of humerus

gives off superior lateral brachial cutaneous nerve

Question 7

what does the axillary nerve innervate?

Answer 7

deltoid

teres minor