Scapula: Posterior view (English)

The posterior surface of the scapula is convex and marked by a protruding ridge of bone known as the spine of scapula. This ridge unevenly separates the posterior surface of the scapula into two divisions: the supraspinous fossa and the much bigger, infraspinous fossa. The supraspinatus muscle sits within the supraspinous fossa, while the infraspinous fossa is occupied by the infraspinatus and teres minor muscles of the rotator cuff complex. The spine of the scapula begins at the root of the spine and extends and widens to form the acromion process of the scapula. The acromion articulates with the clavicle to form the acromioclavicular joint. The spine and acromion of the scapula serve as important attachment points for muscles of the back and shoulder and function as levers for these muscles, particularly the trapezius muscle.Connecting the supraspinous and infraspinous fossa together is the spinoglenoid notch. The suprascapular artery and nerve travel through this notch to supply structures of the scapular region.