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Human Anatomy: Muscle Groups

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Human Anatomy



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Muscle Function & Other Pertinent Medical Information
- EXTENSOR INDICIS -
ORIGIN: Lower posterior shaft of ulna (below extensor pollicis longus) and adjacent interosseous membrane
INSERTION: Extensor expansion of index finger (tendon lies on ulnar side of extensor digitorum tendon)
ACTION: Extends all joints of index finger
NERVE: Posterior interosseous nerve (C7, 8)













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