Muscle Anatomy

extensor carpi radialis brevis

The Extensor Carpi Radialis Brevis (ECRB) muscle is situated in the forearm, characterized by a relatively short and broad belly. Positioned along the lateral aspect of the elbow joint, it contributes to the overall musculature of the forearm.

Originating from the lateral epicondyle of the humerus, the ECRB takes its starting point from the bony prominence on the outer side of the elbow joint. This anatomical origin serves as the anchor for the muscle's extension along the forearm.

The ECRB inserts at the base of the third metacarpal bone, forming a crucial connection with the wrist joint. This insertion point facilitates the muscle's influence on wrist extension, allowing it to actively participate in the control and movement of the hand and wrist.

Functionally, the ECRB plays a vital role as a wrist extensor and abductor. Its contraction leads to the extension and abduction of the wrist joint. Additionally, the muscle contributes to the stabilization of the wrist during gripping activities, offering strength and control to the extensor aspect of the forearm. This multifaceted function highlights the significance of the ECRB in various hand and wrist movements essential for daily activities.