HELENE FOURNIE, ISM / SCIENCE PHOTO LIBRARY HELENE FOURNIE, ISM / SCIENCE PHOTO LIBRARY
Shoulder bones. Illustration of the bones of the shoulder seen in posterior (rear) view. The ball-shaped head (upper left) of the humerus (upper arm bone) forms this joint, fitting into the socket of the scapula, the triangular bone at right. At upper centre is another part of the scapula (the acromion), which articulates with the clavicle (collar bone, across top).
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