The volar branch (ramus volaris; anterior branch) descends along the radial border of the forearm to the wrist, and supplies the skin over the lateral half of its volar surface.

At the wrist-joint it is placed in front of the radial artery, and some filaments, piercing the deep fascia, accompany that vessel to the dorsal surface of the carpus.

The nerve then passes downward to the ball of the thumb, where it ends in cutaneous filaments.

The dorsal branch (ramus dorsalis; posterior branch) descends, along the dorsal surface of the radial side of the forearm to the wrist.

This article incorporates text in the public domain from page 936 of the 20th edition of Gray's Anatomy (1918)