Dscn1133.jpg (66791 bytes) Posterior view, right side

Dscn1142.jpg (66629 bytes) Posterior view, left side

Physically, the acromion process (or just acromion) is a projection of the spine of the scapula.  The acromion is an important landmark of the scapula because it is the articulating surface for the scapula of the acromioclavicular joint.  It articulates with the acromial end (distal end) of the clavicle.  This is an unusual gliding joint (biaxial) in that it allows for gliding (anteroposterior and vertical) and some axial rotation of the scapula.  The joint capsule of this joint is made stronger by two ligaments, the small acromioclavicular ligament on the vertical surface of the bones and the larger coracoclavicular ligament (two parts) between the coracoid process and the inferior surface of the clavicle.  The acromion process of the scapula is the insertion for:
1.    the superior portion of the trapezius.
The acromion process of the scapula is the origin for:
1.    the middle portion of the deltoid.

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