Interossei innervation?

Interossei innervation?

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

Answer: (A)

Interossei are intrinsic hand muscles that move the fingers side-to-side, enabling abduction and adduction. They are innervated by the deep branch of the ulnar nerve, which provides motor supply to most of the intrinsic hand muscles and the medial two lumbricals. The median nerve mainly supplies the lateral two lumbricals and the thenar muscles, not the interossei. The radial nerve covers the extensors of the arm and forearm, not these hand muscles, and the musculocutaneous nerve acts on the flexors of the arm. So the ulnar nerve best fits the motor supply for the interossei.

Interossei are intrinsic hand muscles that move the fingers side-to-side, enabling abduction and adduction. They are innervated by the deep branch of the ulnar nerve, which provides motor supply to most of the intrinsic hand muscles and the medial two lumbricals. The median nerve mainly supplies the lateral two lumbricals and the thenar muscles, not the interossei. The radial nerve covers the extensors of the arm and forearm, not these hand muscles, and the musculocutaneous nerve acts on the flexors of the arm. So the ulnar nerve best fits the motor supply for the interossei.