Course and relations It gives off a branch near the
axilla, which pierces the fascia and supplies the skin covering the
biceps brachii, nearly as far as the
elbow. The nerve then runs down the ulnar side of the arm medial to the
brachial artery, pierces the deep fascia with the
basilic vein, about the middle of the arm, and divides into a volar and an ulnar branch.
Branches Volar branch The
volar branch (ramus volaris; anterior branch), the larger, passes usually in front of, but occasionally behind, the vena mediana cubiti (
median basilic vein). It then descends on the front of the ulnar side of the forearm, distributing filaments to the skin as far as the wrist, and communicating with the
palmar cutaneous branch of the ulnar nerve.
Ulnar branch The
ulnar branch (ramus ulnaris; posterior branch) passes obliquely downward on the medial side of the
basilic vein, in front of the medial epicondyle of the
humerus, to the back of the
forearm, and descends on its ulnar side as far as the
wrist, distributing filaments to the
skin. It communicates with the
medial brachial cutaneous, the
dorsal antebrachial cutaneous branch of the radial, and the dorsal branch of the ulnar. ==See also==