Describe the action of the extensor carpi ulnaris.

The extensor carpi ulnaris is a muscle located on the posterior aspect of the forearm and plays a vital role in wrist movement. Its primary actions involve extending the wrist joint and also contributing to the adduction of the wrist.

When the extensor carpi ulnaris contracts, it pulls the wrist into an extended position, which is essential for various activities such as throwing or pushing. Additionally, its ability to adduct the wrist means it helps move the hand towards the midline of the body, aligning the hand more closely with the ulna. This combination of extension and adduction allows for a more functional range of motion in the wrist, particularly during activities that require precision or strength.

Understanding the actions of this muscle is important in both assessment and rehabilitation within upper extremity treatments, as it can aid in diagnosing issues related to wrist function and guiding effective therapeutic interventions.