Extensor indicis muscle

Extensor indicis muscle
origin
Posterior surface of the ulna , interosseous membrane
approach
Limbs of the index finger
function
Extension of the index finger
Innervation
Radial nerve from the brachial plexus
Spinal segments
C7, C8

The extensor indicis muscle ( Latin for "index finger extensor ") is a skeletal muscle and one of the deep extensors on the forearm . The attachment tendon runs together with the attachment tendons of the extensor digitorum muscle through the fourth tendon sheath compartment of the extensor retinaculum .

The extensor indicis muscle extends the index finger to the extremity. It is a simply feathered muscle.