The anterior compartment of the upper arm consists of three muscles that lie in front of the humerus. The biceps brachii or biceps consists of two heads, long and short, which create flexion in the forearm and upper arm, and adduction in the upper arm. The brachialis muscle, which is underneath the biceps brachii, helps with forearm flexion. It connects the humerus and ulna and is the strongest of the elbow-flexing muscles. The coracobrachialis muscle is on the inner side of the humerus bone and raises and adducts the arm.
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