What is extensor indicis?

The extensor indicis is a muscle located on the back of the forearm. It is one of the deep muscles of the extensor compartment. The primary function of the extensor indicis is to extend the index finger, hence its name.

The extensor indicis originates from the middle third of the posterior surface of the ulna bone and the interosseous membrane. It inserts into the extensor expansion of the index finger.

The action of the extensor indicis is to extend the index finger at the metacarpophalangeal and interphalangeal joints. It also aids in wrist extension.

Injuries to the extensor indicis muscle can occur due to overuse, repetitive movements, or trauma. Treatment for injuries may include rest, ice, compression, and physical therapy.

Overall, the extensor indicis plays an important role in the function of the hand and fingers, particularly in activities that involve fine motor skills and precision gripping.