GROSS ANATOMY

Detailed explanation-1: -The 5 terminal branches of the brachial plexus are the musculocutaneous, median, ulnar, axillary, and radial nerves.

Detailed explanation-2: -Isolated injury to the musculocutaneous nerve is a rare occurrence. Associated signs and symptoms of an isolated musculocutaneous neuropathy may include weakness in elbow flexion or shoulder flexion, atrophy of the biceps brachii, and pain or paresthesia at the lateral forearm.

Detailed explanation-3: -Neuropathies of the musculocutaneous nerve affect elbow flexion and cause numbness in the lateral aspect of the forearm.

Detailed explanation-4: -The musculocutaneous nerve innervates the three muscles of the anterior compartment of the arm: the coracobrachialis, biceps brachii, and brachialis muscles. It is also responsible for cutaneous innervation of the lateral forearm. The musculocutaneous nerve may be the most identifiable nerve of the brachial plexus.