Cutaneous innervation of the upper limbs
Cutaneous innervation of the upper limbs is the nerve supply to areas of the skin of the upper limbs (including the arm, forearm, and hand) which are supplied by specific cutaneous nerves. Modern texts are in agreement about which areas of the skin are served by which cutaneous nerves, but there are minor variations in some of the details.
Source: Wikipedia — Cutaneous innervation of the upper limbs (CC BY-SA 4.0)