Brachioradialis
Origin: Lateral supracondylar ridge of humerus
Insertion: Styloid process of radius
Action: Flexion of elbow in neutral position
Nerve: Radial Nerve (Cervical 5, 6)
Palpate: With forearm in neutral position, palpate muscle belly medial on upper forearm during resisted elbow flexion.
This muscle deserve its name from its origin and insertion. It flexes the elbow with the forearm in mid-position, whereas the biceps flexes the elbow in Supination and the Brachialis flexes the elbow in all positions. Brachioradialis functions when the elbow flexes against resistance or rapidly. Acting alone, this muscle would tend to bring the forearm to mid-position from either a supinated or pronated positions it flexes the elbow.