Question #421
Brachioradialis
Brachioradialis arises from the lateral supracondylar ridge and inserts into the styloid process of the radius. It is the most superficial muscle on the lateral border of the posterior forearm.
The radial nerve passes between brachialis and brachioradialis in the proximal forearm. At the wrist, the tendon lies lateral to the radial artery and is crossed by the tendons of extensor pollicis brevis and abductor pollicis longus.
Despite being in the extensor compartment of the forearm, brachioradialis flexes the elbow joint when the forearm is in a semi-pronated position. This is the best position to test brachioradialis in.
It is innervated by the radial nerve.