Flexor digitorum profundus muscle nerve supply is
**Core Concept**
The flexor digitorum profundus muscle is responsible for flexion of the fingers at the distal interphalangeal joints. Its innervation is crucial for precise finger movements and is derived from the anterior interosseous branch of the median nerve and the ulnar nerve.
**Why the Correct Answer is Right**
The flexor digitorum profundus muscle receives its nerve supply from two distinct branches. The lateral part of the muscle is innervated by the anterior interosseous branch of the median nerve, while the medial part is innervated by the ulnar nerve. This dual innervation allows for coordinated finger movements and precise control over the flexor digitorum profundus muscle.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the flexor digitorum profundus muscle does not receive nerve supply from the radial nerve. The radial nerve primarily innervates the extensor muscles of the forearm and wrist.
**Option B:** This option is incorrect because the flexor carpi radialis muscle is innervated by the median nerve, but it is not responsible for flexion of the fingers at the distal interphalangeal joints.
**Option D:** This option is incorrect because the flexor digitorum superficialis muscle is innervated by the median nerve, but it primarily flexes the fingers at the proximal interphalangeal joints.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the flexor digitorum profundus muscle is responsible for flexion of the fingers at the distal interphalangeal joints, and its innervation comes from both the median and ulnar nerves.
**Correct Answer:** C.