Everyday Muscle.

Extensor Indicis

Hand
This muscle lets you point at things while keeping your other fingers curled — essential for blaming someone.
Function
Extends and adducts index finger independently
Origin
Posterior distal ulna and interosseous membrane
Insertion
Extensor expansion of index finger
Innervation
Posterior interosseous nerve (C7-C8)
Learn this region Quiz this region
Flexor Digitorum Profundus Extensor Digitorum Flexor Pollicis Longus Extensor Pollicis Longus Extensor Pollicis Brevis Abductor Pollicis Longus Adductor Pollicis Opponens Pollicis Opponens Digiti Minimi (Hand) Flexor Digiti Minimi Brevis (Hand)