Extensor Carpi Ulnaris

Musculus extensor carpi ulnaris

Upper Body ArmsForearms

Extensor carpi ulnaris extends the wrist and tilts the hand toward the little-finger side, and is a key dynamic stabilizer of the ulnar side of the wrist during forearm rotation. It is important for wrist health in racket and throwing athletes and in heavy pronated-grip work. Its tendon sheath at the wrist is a common site of irritation in gripping sports.

Actions

Wrist extension, Wrist ulnar deviation (adduction)

Origin

Humeral head from the lateral epicondyle (common extensor tendon); ulnar head from the posterior border of the ulna

Insertion

Dorsal base of the fifth metacarpal bone

Innervation

Deep branch of the radial nerve / posterior interosseous nerve (C7-C8)

Blood supply

Posterior interosseous artery

Heads

Humeral head, Ulnar head

Wikipedia ↗

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