Extensor indicis muscle

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The extensor indicis muscle is a muscle in the forearm that extends the index finger, as in a pointing motion.

Contents

Origin

The extensor indicis muscle originates from the ulna, on the lower posterior shaft below the origin of the extensor pollicis longus muscle and the interosseous membrane adjacent to it.

Insertion

The extensor indicis muscle inserts on the index finger at the extensor expansion.

Action

The extensor indicis muscle extends all the joints of index finger.

Innervation

The extensor indicis muscle innervated posterior interosseous nerve (C7 and C8).

See also

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