Foot as versatile donor source for free tissue transfers. A, Sural nerve graft. B, Extensor digitorum brevis muscle flap. C, First and second toe free tissue transfer. D, First web space free neurovascular flap. E, Dorsalis pedis cutaneous or cutaneous neurovascular free tissue flap. All these procedures require microsurgical techniques. a, Artery; n, nerve; t, tendon; v, vein.