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| Bone: Acromion | |
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| Plan of ossification of the scapula. From seven centers. (Acromion visible at upper left, in blue.) | |
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| Left scapula. Lateral view. (Acromion labeled at upper right.) | |
| Gray's | subject #50 203 |
The acromion process, or simply the acromion (from Greek: akros, "highest", ōmos, "shoulder"), is an anatomical feature on the scapula, together with the coracoid process extending laterally over the shoulder joint.
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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.
Surfaces
- 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.
Borders
- 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
 Diagram of the human shoulder joint |
 The left shoulder and acromioclavicular joints, and the proper ligaments of the scapula. |
 Muscles connecting the upper extremity to the vertebral column. |
 Human arm bones diagram |
External links
- acromion at eMedicine Dictionary
- Bioweb at UWLAX aplab
- Anatomy at Dartmouth shoulder/selftests/surface2dead link
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 As such, some of the information contained herein may be outdated.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.
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Wikipedia content modification information:
- This page was last modified on 19 November 2008, at 23:11.
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