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Muscular Branch of Ulnar Nerve to Flexor Pollicis Brevis (Left)
Nervous System

Muscular Branch of Ulnar Nerve to Flexor Pollicis Brevis (Left)

Ramus musculi flexoris pollicis brevis nervi ulnaris

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Quick Facts

Origin: Deep branch of ulnar nerve.

Course: Crosses the palmar aspect of hand.

Branches: None.

Supply: Deep part of flexor pollicis brevis.

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Origin

The ulnar nerve crosses the wrist between the tendons of flexor carpi ulnaris and flexor digitorum superficialis muscles. It divides into superficial and deep terminal branches at the distal border of the flexor retinaculum. Sometimes, the muscular branch to the deep part of flexor pollicis brevis muscle comes off from the deep branch of ulnar nerve via the nerve to the palmar interossei. Whereas, the superficial head of the muscle receives its innervation from the median nerve.

Course

The deep branch of ulnar nerve passes backwards between the abductor and flexor digiti minimi, and then between the opponens digiti minimi and the fifth metacarpal bone, lying on the hook of the hamate. Finally, it turns laterally within the concavity of the deep palmar arch and innervates the medial two lumbricals and interossei, as the nerve crosses the palm. The deep branch terminates by supplying the adductor pollicis and occasionally the deep head of flexor pollicis brevis muscles.

Branches

No named branches.

Supplied Structures

The muscle branch of ulnar nerve to flexor pollicis brevis supplies motor innervation to the deep part of flexor pollicis brevis muscle in the hand.

Learn more about this topic from other Elsevier products

Ulnar Nerve

ScienceDirect image

The ulnar nerve (and accompanying artery) pass deep to the volar ligament before branching into the deep and superficial branches.

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