Located in the forearm, the brachioradialis muscle flexes and moves the arm at the elbow. The muscle assists with pronation and supination, which involve rotating and moving the forearm without assistance from the upper arm and shoulder. When the muscle helps the forearm pronate, the palm of the hand faces outwards. If the forearm supinates, the palm of the hand faces inwards. The muscle originates on the humerus' lateral supracondylar ridge. This rough margin is located on the lower end of the humerus. From there, the brachioradialis travels the length of the forearm and inserts into the distal radius, at the projection of the radial styloid process. For oxygenated blood, the brachioradialis muscle relies on the services of the radial recurrent artery, which branches off of the radial artery just below the elbow. The radial nerve innervates the muscle, allowing it communicative access to the brain. The muscle shares this nerve with the triceps, anconeus, and extensis carpi radialis longus muscles.
Written and medically reviewed by the Healthline Editorial Team
In Depth: Brachioradialis