Dorsal branch of ulnar nerve

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Nerve: Dorsal branch of ulnar nerve
Nerves of the left upper extremity. (Dorsal branch labeled at bottom left.)
Latin	ramus dorsalis nervi ulnaris
Gray's	subject #210 942
From	ulnar nerve
Dorlands / Elsevier	r_02/12689985

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The dorsal branch of ulnar nerve arises about 5 cm. above the wrist; it passes backward beneath the Flexor carpi ulnaris, perforates the deep fascia, and, running along the ulnar side of the back of the wrist and hand, divides into two dorsal digital branches; one supplies the ulnar side of the little finger; the other, the adjacent sides of the little and ring fingers.

It also sends a twig to join that given by the superficial branch of the radial nerve for the adjoining sides of the middle and ring fingers, and assists in supplying them.

A branch is distributed to the metacarpal region of the hand, communicating with a twig of the superficial branch of the radial nerve.

Additional images

Cutaneous nerves of right upper extremity. Posterior view.

Diagram of segmental distribution of the cutaneous nerves of the right upper extremity. Posterior view.

External links

• Hand kinesiology at UK nerves/ulnar.htm - dorsal at right

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

v • d • e Nerves of upper limbs (primarily): the brachial plexus (C5-T1)
Supraclavicular	root (dorsal scapular, long thoracic) - upper trunk (suprascapular, to the subclavius)
Infraclavicular: lateral cord	lateral pectoral musculocutaneous (lateral cutaneous of forearm) median/lateral root: anterior interosseous - palmar - recurrent - common palmar digital (proper palmar digital)
Infraclavicular: medial cord	medial pectoral cutaneous: medial cutaneous of forearm • medial cutaneous of arm ulnar: muscular - palmar - dorsal (dorsal digital nerves) - superficial (common palmar digital, proper palmar digital) - deep median/medial root: see above
Infraclavicular: posterior cord	subscapular (upper, lower) • thoracodorsal axillary (superior lateral cutaneous of arm) radial: muscular - cutaneous (posterior of arm, inferior lateral of arm, posterior of forearm) - superficial (dorsal digital nerves) - deep (posterior interosseous)
Other	cutaneous innervation of the upper limbs