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Origin: Posterior surface of body of ulna distal to origin or Extensor pollicis longus, and interosseus membrane

Insertion: Into extensor expansion of index finger with Extensor digitorum longus tendon

Innervation: Radial, C6, 7, 8

Action: Extends the MCP joint and, in conjunction with the lumbricals and interossei, extends the IP joints of the index finger

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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