The brachioradialis is a spindle-shaped muscle, which lies on the antero-lateral portion of forearm. It arises from the lateral border of humerus, slightly above the lateral epicondyle and from the lateral intermuscular septum of arm. Then it runs superficially downwards along the radius/thumb side of forearm. When it has reached the middle of forearm, it becomes a long strong tendon, which is inserted into the lateral surface of radius, proximal to the radial styloid process.
Action
The function of the brachioradialis muscle is to flex the forearm at the elbow-joint, working in unison with the biceps brachii and the brachialis. It also assists the pronator teres and supinator muscle to pronate and supinate the radius.
Innervation
This long muscle is innervated by the radial nerve (C5-C6-C7), which is a branch of the brachial plexus.
Blood Supply
It gets oxygenated blood from the anterior descending of the deep brachial artery (arteria profunda brachii).
Below, the superficial muscles of the right forearm, showing the brachioradialis muscle.
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