What is the insertion point of the extensor carpi radialis brevis?

The insertion point of the extensor carpi radialis brevis is at the base of the third metacarpal. This muscle is primarily involved in the extension and abduction of the wrist. It plays a crucial role in movements where the wrist needs to extend while simultaneously moving the hand outward, such as during activities like throwing or swinging a racket. Knowing the correct insertion point is important for understanding how this muscle functions in conjunction with other muscles of the forearm and hand, leading to coordinated wrist actions.

Anatomically, the base of the third metacarpal is significant because it is positioned in a way that allows the extensor carpi radialis brevis to effectively stabilize the wrist during complex movements, which is particularly pertinent for athletes or individuals engaged in sports requiring wrist dexterity and strength.