extensor indicis (muscle)
Definition: 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).
Synonym(s): musculus extensor indicisTA, index extensor (muscle), musculus extensor indicis proprius
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