Muscular Branch of Ulnar Nerve to Flexor Pollicis Brevis (Left)
Ramus musculi flexoris pollicis brevis nervi ulnaris
Read moreQuick Facts
Origin: Deep branch of ulnar nerve.
Course: Crosses the palmar aspect of hand.
Branches: None.
Supply: Deep part of flexor pollicis brevis.
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.
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Ulnar Nerve
The ulnar nerve is a mixed nerve that originates from the C8 and T1 nerve roots and exits the brachial plexus as a terminal branch of the medial cord.
