Muscle Anatomy

extensor digitorum

The extensor digitorum, a prominent forearm muscle, runs along the dorsal side of the forearm, contributing to intricate finger movements.

Arising from the lateral epicondyle of the humerus, the muscle has its origin on the posterior surface of the humerus.

The extensor digitorum inserts into the dorsal surface of the middle and distal phalanges of the four fingers, forming tendons that extend into the digits.

The primary function of the extensor digitorum is to extend the fingers and the hand at the wrist joint. It plays a crucial role in activities involving the opening of the hand, such as typing, playing musical instruments, and grasping objects. Additionally, it aids in stabilizing the wrist during fine motor tasks.