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Musculocutaneous Nerve

Definition

Arises from the lateral cord of the brachial plexus, opposite the lower border of the Pectoralis minor. Fibers derived from C 5,6,7

Muscles innervated

It innervates the Coracobrachialis, Biceps brachii, and the Brachialis.

Course of the nerve

It penetrates the Coracobrachialis muscle

Passes between the Biceps brachii and the Brachialis

Passes to the lateral side of the arm

It is continued into the forearm as the lateral antebrachial cutaneous nerve.

Applied anatomy

Isolated injury, causes weakness of elbow flexion & supination of the forearm.

A sensory disturbance is on the radial side of the forearm.

The nerve is usually involved in an upper brachial plexus palsy

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