Ulnar Nerve

Dorsal Branch of Ulnar Nerve

Origin: Arises from ulnar nerve about 5 cm proximal to flexor retinaculum

Course: Passes distally deep to flexor carpi ulnaris, then dorsally to perforate deep fascia and course along medial side of dorsum of hand, dividing into two to three dorsal digital nerves

Distribution: Skin of medial aspect of dorsum of hand and proximal portions of little and medial half of ring finger (occasionally also adjacent sides of proximal portions of ring and middle fingers)