The hand is supplied by the median, ulnar, and radial (musculospiral) nerves. They are of clinical importance on account of the paralysis of the muscles or disturbance of sensation which accompany their injury (Fig. 374).

Muscular Branches.

Median Nerve............

Abductor pollicis.

Opponens pollicis.

Outer head of flexor brevis.

First and second lumbricales.

Ulnar Nerve.............

To all the rest of the hand muscles.

Superficial Branch.

Palmaris brevis.

Deep Branch..........

Abductor minimi digiti.

Flexor brevis minimi digiti.

Opponens minimi digiti.

Adductor transversus and obliquus pollicis.

Inner head of flexor brevis pollicis.

Two inner lumbricales.

All the interossei.

Cutaneous Branches.

Palmar Surface.

Median Nerve............

Entire radial side of the palm over to the middle of the ring finger and the groove at the wrist between the thenar and hypothenar eminences.

Ulnar Nerve...........

Ulnar side of the little finger, and adjacent sides of little and ring fingers and hypothenar eminence. The adjacent branches of the ulnar and median nerves anastomose.

Dorsal Surface.

Median Nerve...........

Ulnar side of thumb and matrix of nail. Distal.half of the index and middle fin-gers and distal half of the radial side of the ring finger.

Ulnar Nerve.............

Both sides of the little finger and ulnar side of ring finger.

Radial Nerve.............

Both sides of thumb as far as the nail, anastomosing with the median on the ulnar side. Proximal half of the index and, with the ulnar, the proximal half of the middle and radial side of the ring finger.

Fig. 373.   the deep palmar arch

Fig. 373. - the deep palmar arch.

Fig. 374.   Showing the distribution of the nerves of the back of the hand.

Fig. 374. - Showing the distribution of the nerves of the back of the hand.