View source for Subscapularis muscle

{{Muscle infobox |
  Name         = Subscapularis muscle |
  Latin        = musculus subscapularis  |
  GraySubject  = 123 |
  GrayPage     = 440 |
  Image        = Gray411.png |
  Caption      = Deep muscles of the chest and front of the arm, with the boundaries of the axilla. (Subscapularis visible near center top.) |
  Origin       = [[subscapular fossa]] |
  Insertion    = [[lesser tubercle]] of [[humerus]] |
  Action       = [[rotates medially]] [[humerus]]; stabilizes [[shoulder]] |
  Blood        = [[transverse cervical artery]], <ref name="titleUntitled Document">{{cite web |url=http://iris3.med.tufts.edu/headneck/Triangles/Posterior%20Triangle%20of%20the%20Neck.htm |title=Tufts |accessdate=2007-12-11 |format= |work=}}</ref> [[subscapular artery]] |
  Nerve        = [[upper subscapular nerve]], [[lower subscapular nerve]] (C5, C6) |
  MeshName     = |
  MeshNumber   = |
  DorlandsPre  = m_22 |
  DorlandsSuf  = 12551017  |
}}
The '''Subscapularis''' is a large triangular muscle which fills the [[subscapular fossa]].

==Origin and insertion==
It arises from its medial two-thirds and from the lower two-thirds of the groove on the [[axillary border]](subscapular fossa) of the [[scapula]]. 

Some fibers arise from tendinous laminæ which intersect the muscle and are attached to ridges on the bone; others from an [[aponeurosis]], which separates the muscle from the [[Teres major]] and the long head of the [[Triceps brachii]]. 

The fibers pass lateralward, and, gradually converging, end in a tendon which is inserted into the [[lesser tubercle]] of the [[humerus]] and the front of the capsule of the [[shoulder-joint]].

==Relations==
The tendon of the muscle is separated from the [[neck of the scapula]] by a large [[Bursa (anatomy)|bursa]], which communicates with the cavity of the shoulder-joint through an aperture in the capsule.
 
==Innervation==
Innervation to subscapularis is supplied by the [[upper_subscapular_nerve|upper]] and [[lower_subscapular_nerve|lower subscapular nerves]], branches of the posterior cord of the [[brachial plexus]].

==Actions==
The Subscapularis rotates the head of the humerus medially (internal rotation); when the arm is raised, it draws the [[humerus]] forward and downward. It is a powerful defense to the front of the [[shoulder-joint]], preventing [[subluxation|displacement]] of the head of the humerus.

==Additional images==
<gallery>
 Image:Shoulderjoint.PNG|Diagram of the human shoulder joint
 Image:Gray202.png|Left scapula. Costal surface.
 Image:Gray207.png|Left humerus. Anterior view.
 Image:Gray523.png|The axillary artery and its branches.
</gallery>

==References==
{{reflist|2}}

==External links==
* {{MuscleLoyola|subs}}
* {{eMedicineDictionary|Subscapularis+muscle}}
* [http://www.ptcentral.com/muscles/muscletrunk.html#subscapularis PTCentral]

{{Gray's}}
{{Template:Muscles_of_upper_limb}}
{{muscle-stub}}

[[Category:Muscles of the upper limb]]

[[cs:Podlopatkový sval]]
[[de:Musculus subscapularis]]
[[et:Abaluualune lihas]]
[[fr:Muscle subscapulaire]]
[[id:Otot subscapularis]]
[[he:השריר התת שכמי]]
[[nl:Musculus subscapularis]]
[[pl:Mięsień podłopatkowy]]
[[pt:Músculo subescapular]]
[[sv:Subscapularis]]