Subscapularis muscle
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2008-07-04T07:45:04Z
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{{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}}
==External links==
* {{MuscleLoyola|subs}}
* {{eMedicineDictionary|Subscapularis+muscle}}
{{Gray's}}
{{Muscles_of_upper_limb}}
{{muscle-stub}}
[[Category:Muscles of the upper limb]]
[[cs:Podlopatkový sval]]
[[de:Musculus subscapularis]]
[[et:Abaluualune lihas]]
[[fr:Muscle subscapulaire]]
[[hr:Podlopatični mišić]]
[[id:Otot subscapularis]]
[[he:השריר התת שכמי]]
[[hu:Lapocka alatti izom]]
[[nl:Musculus subscapularis]]
[[pl:Mięsień podłopatkowy]]
[[pt:Músculo subescapular]]
[[sv:Subscapularis]]
[[sl:Podlopatična mišica]]