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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.
Bones of the Human Arm The arm reaches from the shoulder to the wrist. It consists of two basic parts: (1) the upper arm, which extends between the shoulder and the elbow, and (2) the forearm, which extends between the elbow and the wrist. The upper arm is formed by one long bone, the humerus.keletal Muscles of the Human Arm Skeletal muscles are responsible for hundreds of movements. When an organism wants to move, signals travel from the brain to the skeletal muscle cells. The muscle cells then contract, or get shorter. Strands of tough connective tissue connect the skeletal muscles to bones.