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Origin: Anterior surface of radius; interosseus membrane, medial border of coronoid process, and medial epicondyle of humerus

Insertion: Base of distal phalanx of thumb

Innervation: Median, C(6), 7, 8, T1

Action: Flexes IP joint of thumb; assists in flexing MCP and CMC joints of thumb; may assist in wrist flexion

vertredline.GIF (89 bytes)Click on the shaded areas or words for more information. Click on the hand (below) to return to the Hand Kinesiology home page.

Deep Extrinsic Flexors | Extrinsic Flexors | Extrinsic Extensors | Extrinsic Muscles | Intrinsic Muscles | Muscle 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