The deep branch of the ulnar nerve is a terminal, primarily motor branch of the ulnar nerve

Ulnar nerve

In human anatomy, the ulnar nerve is a nerve which runs near the ulna bone. The ulnar collateral ligament of elbow joint is in relation with the ulnar nerve. The nerve is the largest unprotected nerve in the human body , so injury is common...

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It is accompanied by the deep palmar branch of ulnar artery

Deep palmar branch of ulnar artery

The deep palmar branch of ulnar artery passes between the Abductor digiti quinti and Flexor digiti quinti brevis and through the origin of the Opponens digiti quinti; it anastomoses with the radial artery, and completes the deep volar arch.-See also:* Deep branch of ulnar nerve...

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Path

It passes between the abductor digiti minimi and the flexor digiti minimi brevis

Flexor digiti minimi brevis (hand)

For the muscle of the foot, see Flexor digiti quinti brevis muscle The flexor digiti minimi brevis is a muscle in the hand that flexes the little finger...

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It then perforates the opponens digiti minimi and follows the course of the deep palmar arch

Deep palmar arch

The deep palmar arch is an arterial network found in the palm. It is usually formed mainly from the terminal part of the radial artery, with the ulnar artery contributing via its deep palmar branch...

 beneath the flexor tendons.

Innervation and termination

At its origin it supplies the hypothenar muscles.

As it crosses the deep part of the hand, it supplies all the interosseous muscles and the third and fourth lumbricals

Lumbricals of the hand

The lumbricals are intrinsic muscles of the hand that flex the metacarpophalangeal joints and extend the interphalangeal joints.-Structure:There are four of these small, worm-like muscles on each hand. These muscles are unusual in that they do not attach to bone...

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It ends by supplying the adductor pollicis and the medial (deep) head of the flexor pollicis brevis.

It also sends articular filaments to the wrist-joint.