extensor indicis (muscle)

(redirected from index extensor (muscle))

ex·ten·sor in·di·cis (mus·cle)

muscle of posterior (extensor) compartment of forearm; origin, dorsal surface of distal ulna and adjacent interosseous membrane; insertion, extensor expansion of index finger; action, independently extends the index finger and assists in extending hand at wrist joint; nerve supply, radial (posterior interosseous).
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