Extensor Carpi Radialis Longus - 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 longus 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 longus passes through the 2nd extensor compartment at the wrist. Attachments: Originates from the lateral supracondylar ridge of the humerus and attaches to the base of the second 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 Pro Feature - Dissection Atlas You've Discovered a Pro Feature Access our Dissection Image Library Enhance your understanding with high-resolution dissection images showcasing real-life anatomy. Learn More Frequent questions What is the function of the extensor carpi radialis longus? The extensor carpi radialis longus primarily facilitates wrist extension and abduction. This muscle plays a key role in movements that involve lifting the hand upwards and moving it away from the body. Where does the extensor carpi radialis longus originate and insert? This muscle originates from the lateral supracondylar ridge of the humerus and inserts at the base of the second metacarpal. These attachments allow it to effectively influence wrist motion. Which nerve innervates the extensor carpi radialis longus? The extensor carpi radialis longus is innervated by the radial nerve. This innervation is crucial for its function in extending and abducting the wrist. What is the blood supply for the extensor carpi radialis longus? The blood supply to the extensor carpi radialis longus comes from the radial artery. This ensures the muscle receives adequate oxygen and nutrients for its activity. In which compartment of the forearm is the extensor carpi radialis longus located? The extensor carpi radialis longus is situated in the superficial compartment of the posterior forearm. Its positioning is significant for its role in wrist movements. Rate This Article