Editing Shoulder (section)

{{About|the part of the human body}}
{{short description|Part of the body}}
{{Infobox anatomy
| Name        = Shoulder
| Latin       = articulatio humeri
| Greek       = 
| Image       = Left shoulder.jpg
| Caption     = Human shoulder
| Width       = 300
| Image2      = Gray327.png
| Caption2    = Capsule of shoulder-joint (distended). Anterior aspect.
| Precursor   = 
| System      = 
| Artery      = 
| Vein        = 
| Nerve       = 
| Lymph       = 
}}
The human '''shoulder''' is made up of three bones: the [[clavicle]] (collarbone), the [[scapula]] (shoulder blade), and the [[humerus]] (upper arm bone) as well as associated muscles, ligaments and tendons.  

The articulations between the bones of the shoulder make up the shoulder [[joint]]s. The [[shoulder joint]], also known as the glenohumeral joint, is the major joint of the shoulder, but can more broadly include the [[acromioclavicular joint]]. 

In [[human anatomy]], the shoulder joint comprises the part of the body where the [[humerus]] attaches to the [[scapula]], and the head sits in the [[glenoid cavity]].<ref name=":0">{{Cite journal|title=shoulder|url=http://medical-dictionary.thefreedictionary.com/shoulder|journal=The Free Dictionary}}</ref> The shoulder is the group of structures in the region of the joint.<ref name=":1">{{Cite web|url=https://en.oxforddictionaries.com/definition/shoulder|archive-url=https://web.archive.org/web/20160929172657/https://en.oxforddictionaries.com/definition/shoulder|url-status=dead|archive-date=September 29, 2016|title=shoulder - definition of shoulder in English {{!}} Oxford Dictionaries|website=Oxford Dictionaries {{!}} English|access-date=2016-11-04}}</ref>

The [[shoulder joint]] is the main joint of the shoulder.  It is a [[ball and socket joint]] that allows the arm to rotate in a circular fashion or to hinge out and up away from the body.  The [[joint capsule]] is a soft tissue envelope that encircles the glenohumeral joint and attaches to the [[scapula]], [[humerus]], and head of the [[biceps]]. It is lined by a thin, smooth [[synovial membrane]]. The [[rotator cuff]] is a group of four muscles that surround the shoulder joint and contribute to the shoulder's stability. The muscles of the rotator cuff are [[supraspinatus]], [[subscapularis]], [[infraspinatus]], and [[teres minor]]. The cuff adheres to the [[glenohumeral capsule]] and attaches to the [[humeral head]].

The shoulder must be mobile enough for the wide range actions of the arms and hands, but stable enough to allow for actions such as lifting, pushing, and pulling.

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