Extensor indicis muscle (anatomy)
Extensor indicis is one of the deep muscles on the extensor aspect of the forearm. It originates from the:
- extensor surface of the ulna at a level between the middle and distal thirds
- adjacent interosseous membrane
It inserts into the extensor expansion of the index finger. At this point, it lies to the ulnar side of extensor digitorum.
It acts to:
- extend all the joints of the index finger
- assist wrist extension
Extensor indicis is innervated by the posterior interosseous nerve (C7,C8).
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