The first two lumbricals, important for precision grip, are innervated by which nerve?

The first two lumbricals, important for precision grip, are innervated by which nerve?

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

Answer: (B)

The ability to perform a precise grip relies on the lumbricals, which flex the metacarpophalangeal joints while extending the interphalangeal joints, helping fine finger control. The first two lumbricals (for the index and middle fingers) receive innervation from the median nerve via its digital branches. This lateral innervation pattern is what enables those fingers to contribute to precise grip tasks. The remaining two lumbricals (for the ring and little fingers) are supplied by the ulnar nerve. The radial nerve does not innervate these intrinsic hand muscles, and the musculocutaneous nerve isn’t involved in hand intrinsics either.

The ability to perform a precise grip relies on the lumbricals, which flex the metacarpophalangeal joints while extending the interphalangeal joints, helping fine finger control. The first two lumbricals (for the index and middle fingers) receive innervation from the median nerve via its digital branches. This lateral innervation pattern is what enables those fingers to contribute to precise grip tasks. The remaining two lumbricals (for the ring and little fingers) are supplied by the ulnar nerve. The radial nerve does not innervate these intrinsic hand muscles, and the musculocutaneous nerve isn’t involved in hand intrinsics either.