Gross Anatomy Block 2 Practice Test

The innervation of the biceps brachii is which nerve?

Radial nerve Musculocutaneous nerve Median nerve Ulnar nerve

Correct Answer:

Musculocutaneous nerve

Explanation:

The main concept is identifying the nerve that supplies the biceps brachii. The biceps brachii is innervated by the musculocutaneous nerve, which arises from the lateral cord of the brachial plexus and carries fibers from C5 to C7. This nerve pierces the coracobrachialis and then travels between the biceps and brachialis, giving motor branches to the biceps. This innervation fits with the muscle’s role in elbow flexion and forearm supination. The other nerves have different primary targets: the radial nerve mainly supplies the posterior arm/forearm extensor muscles; the median nerve supplies most of the forearm flexors and some hand muscles; the ulnar nerve supplies the medial forearm flexors and many intrinsic hand muscles.

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