Scapula

Scapula, or SHOULDER-BLADE, the triangular-shaped bone which lies upon the upper and posterior part of the thorax, connected with the sternum through the mediation of the clavicle, and articulating with the humerus. From the upper part of the posterior surface of the scapula there projects a bony ridge, which is called the spine of the scapula; above this lies what is called the supraspinous fossa, and below it is the infra-spinous fossa. From the external extremity of the spine two processes project, once called the colacoid process and the other the acromion process The clavicle articulates with the latter process. Several of the important muscles of the back and shoulder are attached to the scapula.