Editing Rotator cuff (section)

==Structure==

===Muscles composing rotator cuff===
{| class="wikitable"
! Muscle
! Origin on scapula
! Attachment on humerus
! Function
! Innervation
 |-
 | ''[[Supraspinatus muscle]]''  || [[supraspinous fossa]] || superior<ref>Grays Anatomy 40th</ref> facet of the [[greater tubercle]] || [[Abduction (kinesiology)|abducts]] the [[humerus]] || [[Suprascapular nerve]]
([[Cervical spinal nerve 5|C5]])
 |-
 | ''[[Infraspinatus muscle]]'' || [[infraspinous fossa]] || middle facet of the [[greater tubercle]]|| [[external rotation|externally rotates]] the humerus || [[Suprascapular nerve]]
([[Cervical spinal nerve 5|C5]]–[[Cervical spinal nerve 6|C6]])
 |-
 | ''[[Teres minor muscle]]''  || middle half of [[lateral border]] || inferior facet of the [[greater tubercle]] || externally rotates the humerus || [[Axillary nerve]]
([[Cervical spinal nerve 5|C5]])
 |-
 | ''[[Subscapularis muscle]]''  || [[subscapular fossa]] || [[lesser tubercle]] || [[internal rotation|internally rotates]] the [[humerus]] || [[Upper subscapular nerve|Upper]] and [[Lower subscapular nerves|Lower]] subscapular nerve
([[Cervical spinal nerve 5|C5]]–[[Cervical spinal nerve 6|C6]])
|}

The supraspinatus muscle spreads out in a horizontal band to insert on the superior facet of the [[greater tubercle]] of the [[humerus]].  The greater tubercle projects as the most [[Lateral (anatomy)|lateral]] structure of the [[humeral head]]. [[Medial (anatomy)|Medial]] to this, in turn, is the [[lesser tubercle]] of the humeral head. The subscapularis muscle [[Origin (anatomy)|origin]] is divided from the remainder of the rotator cuff origins as it is deep to the [[scapula]].

The four [[tendon]]s of these muscles converge to form the rotator cuff tendon.  These tendinous [[Insertion (anatomy)|insertions]] along with the [[articular capsule]], the [[coracohumeral ligament]], and the [[glenohumeral ligament]] complex, blend into a confluent sheet before insertion into the humeral tuberosities (i.e. greater and lesser tubercle).<ref name="matava">{{cite journal |vauthors=Matava MJ, Purcell DB, Rudzki JR |title=Partial-thickness rotator cuff tears |journal=Am J Sports Med |volume=33 |issue=9 |pages=1405–17 |year=2005 |pmid=16127127 |doi=10.1177/0363546505280213 |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"/> The supraspinatus is most commonly involved in a [[rotator cuff tear]].