Acromion
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207922610
2008-04-24T18:42:22Z
97.94.104.249
/* Surfaces */
{{Infobox Bone |
Name = Acromion |
Latin = |
GraySubject = 50 |
GrayPage = 203 |
Image = Gray206.png |
Caption = Plan of ossification of the [[scapula]]. From seven centers. (Acromion visible at upper left, in blue.) |
Image2 = Gray205 left scapula lateral view.png |
Caption2 = Left scapula. Lateral view. (Acromion labeled at upper right.) |
System = |
MeshName = |
MeshNumber = |
DorlandsPre = a_10 |
DorlandsSuf = 12108390 |
}}
The '''acromion process''', or simply the '''acromion''', is an [[anatomy|anatomical]] feature on the [[scapula]].
==In humans==
It is a continuation of the '''scapular spine''', and hooks over anteriorly.
The acromion articulates with the [[collar bone|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 [[Tubercle (anatomy)|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 [[bat]]s ([[Mammalia]]: [[Chiroptera]]) is particularly elongated compared to that of [[human]]s.
==Additional images==
<gallery>
Image:Shoulderjoint.PNG|Diagram of the human shoulder joint
Image:Gray326.png|The left shoulder and acromioclavicular joints, and the proper ligaments of the scapula.
Image:Gray409.png|Muscles connecting the upper extremity to the vertebral column.
Image:Human arm bones diagram.svg|Human arm bones diagram
</gallery>
==External links==
* {{eMedicineDictionary|acromion}}
* {{BiowebUW|aplab/Table_of_Contents/Lab_04/Scapula_1/scapula_1.html|aplab}}
* {{DartmouthAnatomy|shoulder/selftests/surface2}} {{Dead link|date=January 2008}}
{{Gray's}}
{{Bones of upper extremity}}
[[Category:Animal anatomy]]
[[Category:Bones of thoracic limb]]
{{Veterinary-med-stub}}
{{musculoskeletal-stub}}
[[ca:Acròmion]]
[[fr:Processus d'acromion]]
[[gl:Acromion]]
[[id:Acromion]]
[[it:Acromion]]
[[ru:Акромион]]
[[th:อโครเมียน]]
[[uk:Акроміон]]