The biceps brachii (bi'seps bra'ke-i) is a fleshy muscle that forms a long, rounded mass on the anterior side of the arm. It connects the scapula to the radius and flexes the forearm at the elbow and rotates the hand laterally (supination), as when a person turns a doorknob or screwdriver (fig. 9.29).
The brachialis (bra'ke-al-is) is a large muscle beneath the biceps brachii. It connects the shaft of the humerus to the ulna and is the strongest flexor of the elbow (fig. 9.29).
The brachioradialis (bra"ke-o-ra"de-a'lis) connects the humerus to the radius. It aids in flexing the elbow (fig. 9.30).
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