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Origin: First and Second:  Radial surface of Flexor profundus tendons of index and middle fingers, respectively. Third:  Adjacent sides of Flexor profundus tendons of middle and ring fingers. Fourth:   Adjacent sides of Flexor profundus tendons of ring and little fingers.

Insertion: Into the radial border of the extensor expansion on the dorsum of the respective digits.

Innervation: Nerve to Lumbricals I, II:  Median, C (6), 7, 8, T1. Nerve to Lumbricals III, IV:  Ulnar, C (7), 8, T1.

Action:  Extend the IP joints and simultaneously flex the MCP joints of the second through fifth digits.  The lumbicals also extend the IP joints when the MCP joints are extended.

Volar Intinsic Superficial | Volar Instrinsic Deep | Dorsal Intrinsic Muscles | Extrinsic 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