acromion
Important muscular and ligamentous attachments to the right scapula, posterior surface.
The acromion, also called the acromion process, is the lateral, more-or-less oblong end of the spine of the scapula (shoulder blade). Part of the acromion articulates with the clavicle (collar bone) to form the acromioclavicular joint. From the acromion a portion of the deltoid muscle arises.