The brachioradialis is a muscle within the superficial compartment of the posterior forearm. The medial edge of the brachioradialis forms the lateral border of the cubital fossa. Attachments: Originates from the proximal aspect of the lateral supracondylar ridge of humerus. It attaches to the distal end of the radius, just proximal to the radial styloid process. Actions: Flexion at the elbow. Contributes to supination at the proximal radioulnar joint. Innervation: Radial nerve. Blood supply: Radial artery. By TeachMeSeries Ltd (2025) 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 Print Article Rate This Article