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Origin: Middle one third of posterior surface of ulna distal to origin of Abductor pollicis longus, and interosseus membrane

Insertion: Base of distal phalanx of thumb, dorsal surface

Innervation: Radial, C6, 7, 8

Action: Extends the IP joint and assists in extension of the MCP and CMC of the thumb. Abducts (radially deviates) and extends the wrist

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Extrinic Extensors | Extrinsics Flexors | Extrinsic Muscles | Instinsic Muscles | Musclel Arrangement | Help | Hand Kinesiology

Lorie Richards and Janice Loudon, University of Kansas Medical Center, School of Allied Health,
Occupational and Physical Therapy Education, October 1997