Brachial Plexus Practice Test

Which of the following is NOT innervated by the median nerve?

Pronator Teres Flexor Carpi Ulnaris Palmaris Longus Flexor Digitorum Profundus (lateral half)

Correct Answer:

Flexor Carpi Ulnaris

Explanation:

The main idea is how the forearm flexors are innervated by the nerves. Most flexors in the anterior forearm get input from the median nerve, but there are two notable exceptions: the flexor carpi ulnaris and the medial (ulnar) half of the flexor digitorum profundus are supplied by the ulnar nerve. Among the options, the muscle that is not supplied by the median nerve is the flexor carpi ulnaris. It flexes and adducts the wrist, and its innervation comes from the ulnar nerve. The other muscles listed—pronator teres, palmaris longus, and the lateral half of flexor digitorum profundus—are innervated by the median nerve (with FDP’s lateral half receiving median nerve input and the medial half by the ulnar nerve).

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