Scapula

In anatomy, the scapula, or shoulder blade, is the bone that connects the arm bone with the collar bone.

The scapula is a flat bone, roughly triangular in shape. The anterior (front) side of the scapula forms the subscapular fossa to which the subscapularis[?] muscle attaches.

The posterior surface of the scapula is divided by a bony projection into the supraspinous fossa and the infraspinous fossa. This projection is called the spine of the scapula, and continues past the main part of the bone, to point forward as a bony hook called the acromion.

Another hook like projection comes off the the lateral angle of the scapula, and is called the coracoid process. The end of this hook is the site of attachment of many muscles, such as the coracobrachialis[?] muscle.

Near the base of the coracoid process, so also on the lateral angle, there is a depression called the glenoid cavity. This forms the socket that the head of the humerus articulates with.

The scapula also articulates with the clavicle, via the acromion process. (The acromioclavicular joint.)