Extensor Carpi Radialis Brevis - Podcast Version 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x The extensor carpi radialis brevis is a muscle within the superficial compartment of the posterior forearm. Its lateral position within the forearm produces abduction as well as extension at the wrist. The tendon of the extensor carpi radialis brevis passes through the 2nd extensor compartment at the wrist. Attachments: Originates from the lateral epicondyle of the humerus and attaches to the base of the third metacarpal. Actions: Extension and abduction at the wrist Innervation: Radial nerve. Blood supply: Radial artery By TeachMeSeries Ltd (2026) Fig 1The muscles in the superficial layer of the posterior forearm. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Frequent questions What is the extensor carpi radialis brevis? The extensor carpi radialis brevis is a muscle located in the superficial compartment of the posterior forearm, responsible for wrist extension and abduction. It plays a crucial role in movements involving the wrist. What are the attachments of the extensor carpi radialis brevis? This muscle originates from the lateral epicondyle of the humerus and attaches to the base of the third metacarpal. These attachments enable its function in wrist movements. What actions does the extensor carpi radialis brevis perform? The extensor carpi radialis brevis primarily facilitates extension and abduction at the wrist. These actions are essential for various hand and wrist activities. Which nerve innervates the extensor carpi radialis brevis? The extensor carpi radialis brevis is innervated by the radial nerve. This nerve supply is vital for the muscle's functional capabilities. What is the blood supply for the extensor carpi radialis brevis? The blood supply to the extensor carpi radialis brevis comes from the radial artery. Proper blood flow is necessary for muscle health and function. Rate This Article