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Extensor indicis

Other Terms: Musculus extensor indicis, Muscle extenseur de l'index

Muscle parts

None

Latin name

Musculus extensor indicis

Latin muscle parts

None

Group

Antebrachial muscle – posterior compartment – radial group

Etymology

In English this muscle’s name is the muscle that straightens the pointer (index) finger. The word extensor comes from the Latin ex meaning “out from” and tendere meaning “to stretch.” The term indicis is from the Latin indicare meaning “to make known or point out,” because the first finger was used to point out things.

Origin

Posterior surface of ulna in lower half where it attaches distal to the extensor pollicis longus

Insertion

On the ulnar side of extensor digitorum tendon near the head of the metacarpal bone it joins the extensor expansion

Action

Assists with extension of the wrist and the index finger

Nerve supply

Radial nerve (C7 and C8)

Blood supply

From proximal to distal, the muscle belly receives blood from the posterior interosseous artery and perforating branches from the anterior interosseous artery. The distal tendon receives blood from the a branch of the radial artery in the anatomical snuff box, the dorsal metacarpal artery, and small branches from the dorsal carpal arch.

Latin

Musculus extensor indicis

French

Muscle extenseur de l'index

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