The upper extremity consists of the shoulder, the arm, the forearm, and the hand. The shoulder consists of the scapula and clavicle: the arm of the humerus ; the forearm of the radius and ulna ; and the hand of the carpus, metacarpus, and fingers.
The humerus or arm-bone (french : humérus), the largest bone of the upper extremity, extends from the scapula to the bones of the fore-arm, with each of which it is articulated. Its direction is vertical, with an inclination inwards towards the lower end. Long and irregularly cylindrical in form, the humerus is divisible into a body and two extremities.
This scapula (French : scapula, omoplate), is placed upon the upper and back part of the the thorax, occupies the space from the second to the seventh rib, and forms the posterior part of the shoulder. Its form is irregularly triangular and flat. It presents for examination two surfaces, three borders, and three angles.
The ulna, (French : ulnlna) is placed at the inner side of the forearm ; it is a long and rather irregular bone, larger at the upper than at the lower extremity, a conformation the reverse of that which obtains in the radius.
The radius (French : Radius), shorter than the ulna by the length of the olecranon process, is placed at the external side of the fore-arm, extending from the humerus to the carpus. It is broader below than above, slightly curved in its form, and divided into a body and two extremities.
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