The acromion of the scapula rotates on the acromial end of the clavicle. The supraspinatus muscle tendon passes laterally beneath the cover of the acromion. Also called Clavicular articular facet of acromion. Below, the fascia is attached to the thoracic outlet (acromion, clavicle, and manubrium). It originates at the acromion process and inserts at the deltoid ridge. They cushion and protect the rotator cuff from the bony arch of the acromion. The greater/lesser tubercule is located from the top of the acromion laterally and inferiorly. The shoulderblade has a rectangular acromion. Pointing laterally forward, it, together with the acromion, serves to stabilize the shoulder joint. To locate the site, palpate the lower edge of the acromion process. This bump is considered to be the same feature as the acromion process of humans. First, the identification of acromion type shows poor intra- and inter-observer reliability.