Musculocutaneous Nerve

Musculocutaneous Nerve

Question 1. Describe the musculocutaneous nerve in brief.
Answer.

The musculocutaneous nerve, as its name implies, supplies the muscles of the front of the arm and skin on the lateral side of the forearm.

Musculocutaneous Nerve Origin

From the lateral cord of the brachial plexus (C5, C6, and C7).

Musculocutaneous nerve

Musculocutaneous Nerve Course

It arises obliquely from the lateral cord of the rachial plexus behind the pectoralis minor muscle. There it lies lateral to the axillary artery. It pierces the coracobrachialis muscle and reaches the lateral side of the arm. Then it runs laterally downwards between the biceps brachii and brachialis muscles. At the crease of the elbow, it pierces the deep fascia lateral to the tendon of the biceps brachii, from where it continues as the lateral cutaneous nerve of the forearm.

Musculocutaneous Nerve  Branches

Muscular:

To the coracobrachialis, biceps brachii, and brachialis.

Branches of musculocutaneous nerve

Cutaneous:

The lateral cutaneous nerve of the forearm to the lateral side of the forearm.

Articular:

To the elbow joint.

Musculocutaneous Nerve  Applied Anatomy

Isolated lesions of the musculocutaneous nerve are rare.