Name

# Brachioradialis

Pronunciation

(bra-ke-o-ra-de- A-lus)

Origin/Proximal Attachment

Upper lateral supracondylar ridge of humerus (between the triceps & brachialis muscles); lateral intermuscular septum of humerus

Insertion/Distal Attachment

Superior aspect of styloid process of radius; lateral side of distal 1/2-1/3 of radius; antebrachial fascia

Action/Relevance

Flexes the forearm at the elbowPronates the forearm when supinatedSupinates the forearm when pronated

Innervation

Radial nerve (C5, 6)

Notes

Brachioradialis is a muscle located in the forearm, that acts to flex the elbow.

Attached to the distal radius and the lateral epicondyle of the humerus, its body can be made visible in certain types of flexion.

If a person half-pronates their arm, to make a fist like they're holding a handled vessel of beer, then puts their fist under a table or desk and tries to flex at the elbow, the brachioradialis will stand out of the forearm, visible under the skin.

It is on the dorsal side of the forearm, so is innervated by the radial nerve.