Functions of the shoulder girdle.

The shoulder joint is spherical. It is formed by the head of the humerus and the articular cavity of the scapula. This joint allows flexion (raising the arm forward) and extension (stretching the arm back) of the arm in the shoulder joint, mixing (moving the arms in the horizontal plane at shoulder level forward) and extension (moving the arms to the horizontal plane at shoulder level backward) of the arms, rotation hands inward and outward, abduction (to the side) and abduction (to the lateral surface of the body) of the hand.