Deep branch of ulnar nerve

Deep branch of ulnar nerve

The deep branch of the ulnar nerve.

The deep branch of ulnar nerve is a branch of the ulnar nerve that supplies the intrinsic muscles of the hand and the skin of the medial part of the hand.

Anatomy

The deep branch of the ulnar nerve originates from the ulnar nerve in the forearm. It travels through the Guyon's canal and then divides into a superficial and a deep branch. The deep branch of the ulnar nerve innervates the hypothenar muscles, the interossei muscles, the third and fourth lumbricals, the adductor pollicis, and the medial two lumbricals.

Clinical significance

Damage to the deep branch of the ulnar nerve can result in claw hand, a condition where the last two fingers are extended at the metacarpophalangeal joints and flexed at the interphalangeal joints. This is due to the loss of function of the interossei and the medial two lumbricals.

See also

• Ulnar nerve
• Claw hand
• Guyon's canal

References

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