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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
