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These bulky muscles also give the arm its strength. The muscles of the arm that can be seen easily on the surface include: 1  Biceps: This large muscle of the upper arm is formally known as the biceps brachii muscle, and rests on top of the humerus bone. 2  It rotates the forearm and also flexes the elbow.
Skeletal muscles are attached to your bones by strong tissues calledtendons. The tendons on the end ofthe muscle attach firmly to thebone. As the fibers in a muscle contract, they shorten and pull the ten-don. The tendon, in turn, pulls the bone and makes it move.You can feel your muscles moving your bones. Place your left arm,stretched out flat, in front of you on a table. Place the fingers of yourright hand just above your left elbow. Bend your elbow and raise andlower your left arm. You are contracting your biceps.