Editing Shoulder (section)

===Rotator cuff===
{{Main|Rotator cuff}}
[[File:Shoulder joint.svg|thumb|Shoulder anatomy, front view]]
[[File:Shoulder joint back-en.svg|thumb|Shoulder anatomy, back view]]
The [[rotator cuff]] is an anatomical term given to the group of four muscles and their tendons that act to stabilize the shoulder.<ref name=":4" /> These muscles are the [[supraspinatus muscle|supraspinatus]], [[infraspinatus muscle|infraspinatus]], [[teres minor muscle|teres minor]] and [[subscapularis muscle|subscapularis]] and that hold the head of the humerus in the glenoid cavity during movement.<ref name=":4" /> The cuff adheres to the glenohumeral capsule and attaches to the [[humeral head|head of the humerus]].<ref name=":4" /> Together, these keep the humeral head in the [[glenoid cavity]], preventing upward migration of the [[humeral head]] caused by the pull of the [[deltoid muscle]] at the beginning of arm elevation. The infraspinatus and the teres minor, along with the anterior fibers of the deltoid muscle, are responsible for external rotation of the arm.<ref name="favard">{{cite journal|last2=Bacle|first2=Guillaume|last3=Berhouet|first3=Julien|year=2007|title=Rotator cuff repair|journal=Joint Bone Spine|volume=74|issue=6|pages=551–7|doi=10.1016/j.jbspin.2007.08.003|pmid=17993287|last1=Favard|first1=Luc}}</ref>

The four [[tendon]]s of these muscles converge to form the rotator cuff tendon.  This tendon, along with the articular capsule, the [[coracohumeral ligament]], and the [[glenohumeral ligament]] complex, blend into a confluent sheet before insertion into the humeral tuberosities.<ref name="matava">{{cite journal |doi=10.1177/0363546505280213 |pmid=16127127 |title=Partial-Thickness Rotator Cuff Tears |journal=American Journal of Sports Medicine |volume=33 |issue=9 |pages=1405–17 |year=2005 |last1=Matava |first1=M. J. |last2=Purcell |first2=D. B. |last3=Rudzki |first3=J. R. |s2cid=29959313 }}</ref>  The [[infraspinatus]] and [[teres minor]] fuse near their [[musculotendinous junction]]s, while the [[supraspinatus]] and [[subscapularis]] tendons join as a sheath that surrounds the biceps tendon at the entrance of the bicipital groove.<ref name="matava" />