The brachioradialis, also historically known as the supinator longus, is a muscle of the forearm that flexes the forearm at the elbow. It is also capable of both pronation and supination, depending on the position of the forearm. Near the elbow, it forms the lateral limit of the cubital fossa, or elbow pit.

Nerve supply

Despite the bulk of the muscle body being visible from the anterior aspect of the forearm, the brachioradialis is a posterior compartment muscle and consequently is innervated by the radial nerve. Of the muscles that receive innervation from the radial nerve, it is one of only four that receive input directly from the radial nerve. The other three are the triceps, anconeus, and extensor carpi radialis longus. (All other posterior compartment muscles that receive radial innervation are supplied by the deep branch of the radial nerve.)

Function

The brachioradialis flexes the forearm at the elbow.

Additional images

See also

Supinator (also historically known as "supinator brevis").

References

  • - "Transverse section through the left arm just proximal to the elbow."
  • - "Superficial muscles of the anterior (flexor) compartment of the left forearm."
  • - "Superficial muscles of the posterior (extensor) compartment of the left forearm."