Nerves T7 to T9 supply the skin from the xiphoid process to just above the umbilicus.
T10 supplies the skin around the umbilicus.
T11, T12, and L1 supply the skin from just below the umbilicus to, and including, the pubic region (Fig. 4.38).
Additionally, the ilio-inguinal nerve (a branch of
L1) supplies the anterior surface of the scrotum or labia majora, and sends a small cutaneous branch to the thigh.