The acromion is the lateral extension of the spine of the scapula, and connects with the clavicle. It hangs over the meeting of the humerus and the scapula to provide protection. The coracoid process also helps to protect the shoulder join, and is an attachment for several muscles and ligaments, including your chest muscles and biceps. The glenoid cavity, along with the head of the humerus, form the ball-and-socket joint of your shoulder. Compared to other ball-and-socket joints in the body, this one is shallow - allowing for great mobility and great instability.

There are seveteen muscles that have origins or attachments on the scapula!! They're all working together simultaneously!! Wild!! We have the omohyoid, a few fibers of the latissimus dorsi, teres major and teres minor, infraspinatous and supraspinatous, deltoid, subscapularis, the long and short head of the biceps brachii, the long head of the triceps brachii, coracobrachialis, pectoralis minor, serratus anterior, rhomboid major and rhomboid minor, levator scapulae and trapezius.