Acromion 211364 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]]