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Bone: Acromion
Plan of ossification of the scapula. From seven centers. (Acromion visible at upper left, in blue.)
Gray205 left scapula lateral view.png
Left scapula. Lateral view. (Acromion labeled at upper right.)
Gray's subject #50 203
/ Elsevier

The acromion process, or simply the acromion, is an anatomical feature on the scapula.

In humans

It is a continuation of the scapular spine, and hooks over anteriorly.

The acromion articulates with the clavicle to form the acromioclavicular joint.

The acromion forms the summit of the shoulder, and is a large, somewhat triangular or oblong process, flattened from behind forward, projecting at first lateralward, and then curving forward and upward, so as to overhang the glenoid cavity.


  • Its superior surface, directed upward, backward, and lateralward, is convex, rough, and gives attachment to some fibers of the Deltoideus, and in the rest of its extent is subcutaneous.
  • Its inferior surface is smooth and concave.


  • Its lateral border is thick and irregular, and presents three or four tubercles for the tendinous origins of the Deltoideus.
  • Its medial border, shorter than the lateral, is concave, gives attachment to a portion of the Trapezius, and presents about its center a small, oval surface for articulation with the acromial end of the clavicle.

In animals

The acromion process of bats (Mammalia: Chiroptera) is particularly elongated compared to that of humans.

Additional images

External links

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.


ca:Acròmion gl:Acromion id:Acromion it:Acromion uk:Акроміон