How Can You Remember the Acromion Process?


Quick Answer

The acromion process is one of two narrow bony projections that sit at the top of the scapula, or the shoulder blade. One way to remember the acromion process is in relation to the other features of the scapula and shoulder muscles: it extends forwards over the shoulder like an epaulet on a uniform and is the point where the rotator cuff muscles sometimes becomes impinged, or pinched.

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Full Answer

The scapula is a large flat bone that rests at the top of the ribs on the back. Its most important feature is the convex depression where the humerus, the upper arm bone, meets it. This is known as the glenoid cavity and form the socket half of the shoulder's ball-and-socket joint, the glenohumeral joint. The acromion passes just over the joint and meets the far end of the clavicle. The four rotator cuff muscles work together to abduct the arm and rotate it forward and backward. All four muscles are anchored on the scapula and attach to the head, or ball, of the humerus. The acronym SITS refers to the first letter of each muscle: supraspinatus, infraspinatus, teres minor and subscapularis. Since they all pass underneath the acromion, it could be said that the acromion "SITS" above the humerus. The Romans called the scapula the "shoulder blade" because it looks like a small shovel.

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