Brachioradialis
Latin: M. brachioradialis sinistra
Location: Forearm
Paired structure: one on the left and one on the right side of the body.
View the brachioradialis in 3DOrigin
Proximal two-thirds of the lateral supracondylar ridge of the humerus.
Insertion
Distal radius, styloid process (lateral surface).
Action
Flexes the elbow most powerfully in the mid-prone (thumb-up) position — the 'hammer' position; also helps return the forearm from full pronation or supination.
Nerve supply
Radial nerve (C5–C6) — although it flexes the elbow, it develops in the posterior (extensor) compartment, hence its radial supply.
Blood supply
Radial recurrent artery.
Clinical relevance
Brachioradialis is the muscle hammered in the standard supinator (brachioradialis) reflex testing C5–C6; its tendon guides the distal-radial surgical approach (Henry's incision).
Educational anatomy reference, not medical advice. About this content.