Subscapularis muscle 3042696 223485158 2008-07-04T07:45:04Z Slodave 301776 +iw {{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]]