Cutaneous nerves of forearm

Lateral cutaneous nerve of the forearm:

The lateral cutaneous nerve of the forearm pierces the deep fascia at the level of the elbow joint and supplies the preaxial border of the forearm, by anterior and posterior branches, as far distally as the ball of the thumb.

Medial cutaneous nerve of the forearm:

The medial cutaneous nerve of the forearm is roughly symmetrical with the lateral cutaneous nerve, supplying the postaxial border of the forearm by anterior and posterior branches as far distally as the wrist. Their areas of cutaneous distribution meet at the anterior axial line, where there is minimal overlap.