Muscular Branch of Median Nerve to Flexor Pollicis Longus (Left)
Ramus musculi flexor pollicis longi nervi mediani
Read moreQuick Facts
Origin: Anterior antebrachial interosseous nerve (C8, T1).
Course: Descends to the lateral half of flexor digitorum profundus.
Branches: None.
Supply: Flexor pollicis longus muscle.
Related parts of the anatomy
Origin
The median nerve gives off an anterior interosseous nerve, which is the main branch of the median nerve in the forearm. The muscular branch to flexor pollicis longus contains motor neurons from the C7—C8 cervical spinal segments.
Course
After passing between the two heads of pronator teres muscle, the median nerve descends beneath the fibrous arch of the flexor digitorum superficialis muscle, on the surface of the flexor digitorum profundus. Here, in the upper part of the forearm, the median nerve gives off a deep branch called the anterior antebrachial interosseous nerve which innervates the deep muscles in the anterior compartment of the forearm as it descends on the surface of the interosseous membrane. The muscular branches given off from the anterior interosseous nerve are issued to the following muscles: flexor pollicis longus, flexor digitorum profundus, and pronator quadratus.
Branches
There are no named branches.
Supplied Structures
The muscle branch of median nerve to flexor pollicis longus provides motor innervation to flexor pollicis longus muscle.
List of Clinical Correlates
—Anterior interosseous nerve syndrome (Chi and Harness, 2010)
References
Chi, Y. and Harness, N. G. (2010) 'Anterior Interosseous Nerve Syndrome', Journal of Hand Surgery, 35(12), pp. 2078-2080.
