Muscular Branch of Median Nerve to Pronator Quadratus (Left)

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 pronator quadratus contains motor neurons from the C8—T1 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.

The muscular branch to pronator quadratus passes deep to the muscle and innervates it from the dorsal (deeper) side (Svízenská et al., 2005).

Branches

There are no named branches.

Supplied Structures

The muscle branch of median nerve to pronator quadratus provides motor innervation to pronator quadratus muscle.

References

Svízenská, I., Cizmár, I. and Visna, P. (2005) 'An anatomical study of the anterior interosseous nerve and its innervation of the pronator quadratus muscle', J Hand Surg Br, 30(6), pp. 635-7.