The lateral two digits (2-3) of the flexor digitorum profundus are innervated by which nerve?

The lateral two digits (2-3) of the flexor digitorum profundus are innervated by which nerve?

• A. Ulnar nerve
• B. Radial nerve
• C. Musculocutaneous nerve
• D. Median nerve

Answer: (C)

The muscle flexor digitorum profundus has dual nerve supply in the forearm. The portion that flexes the index and middle fingers (digits 2–3) is innervated by the anterior interosseous nerve, a branch of the median nerve. The portion that flexes the ring and little fingers (digits 4–5) is innervated by the ulnar nerve. The radial nerve does not innervate FDP, and the musculocutaneous nerve supplies arm flexors rather than the forearm digitorum profundus. So, the innervation for the lateral digits is the median nerve (via its anterior interosseous branch).

The muscle flexor digitorum profundus has dual nerve supply in the forearm. The portion that flexes the index and middle fingers (digits 2–3) is innervated by the anterior interosseous nerve, a branch of the median nerve. The portion that flexes the ring and little fingers (digits 4–5) is innervated by the ulnar nerve. The radial nerve does not innervate FDP, and the musculocutaneous nerve supplies arm flexors rather than the forearm digitorum profundus. So, the innervation for the lateral digits is the median nerve (via its anterior interosseous branch).