The upper arm is moved by the muscles of the shoulder girdle; the lower arm is moved by muscles of the upper arm; the fingers are moved by muscles of the lower arm. Raising the arm above your head is gliding movement at the synovial shoulder joint. This is extension and abduction movement. The bone of the upper arm – the humerus, articulates with the scapula at the shoulder joint. Extensor digitorum contracts to extend the phalanges of the fingers.Humerus articulates with radius and ulna at elbow joint.
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