Knowledge

Subscapularis muscle

Source ๐Ÿ“

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the scapula. However, the tendon of primary interest does not get mapped as closely as desired. As anatomical analysis showed, it is only by external rotation possible to see the ventral part of the joint socket and its labrum. While at the neutral position the tuberculum minus occludes the view. Summing up it is through an external arm rotation and a medially applied 5 MHz sector sonic head possible to display the ventral part of the joint socket and its labrum with notedly lower echogenicity.
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Along with higher contrast resolution it has an elevated signal-to-noise ratio and significantly reduced inter- and intraobserver variability compared with conventional US. Additionally it is possible to nearly eliminate ordinary US artifacts, i.e. side-lobe, near-field artifacts, reverberation artifacts. As aforementioned THI has already led to enhanced abdominal, breast, vascular and cardiac sonography.
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Lift-off test is the established clinical test for examination of the subscapularis. The bear hug test (internal rotation while palm is held on opposite shoulder and elbow is held in a position of maximal anterior translation) for subscapularis muscle tears has high sensitivity. Positive bear-hug and
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THI involves the use of harmonic frequencies that originate within the tissue as a result of nonlinear wave front propagation and are not present in the incident beam. These harmonic signals may arise differently at anatomic sites with similar impedances and thus lead to higher contrast resolution."
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Mack et al. developed an ultrasonographic procedure with which it is possible to explore almost the complete rotator cuff within six steps. It unveils clearly the whole area from the subedge of the subscapularis tendon until the intersection between the infraspinatus tendon and musculus teres minor.
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For musculo-skeletal aspects THI has not been used that much, although this method features some useful potential. For example, for the still tricky discrimination between the presence of a hypoechoic defect and/or loss of the outer tendon convexity/non-visualization of the tendon, that is between
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The subscapularis tendon lies approximately 3 to 5 cm under the surface. Quite deep for ultrasonography, and therefore displaying through a highly penetrative 5 MHz linear applicator is worth a try. And it really turned out to ease a detailed examination of the muscle which just abuts to
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There is no singularly imaging device or technique for a satisfying and complete subscapularis examination, but rather the combination of the sagittal oblique MRI / short-axis US and axial MRI / long-axis US planes seems to generate useful results. Additionally, lesser tuberosity bony changes have
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One of six steps does focus on the subscapularis tendon. In the first instance the examinator guides the applicator to the proximal humerus as perpendicularly as possible to the sulcus intertubercularis. Gliding now medially shows the insertion of the subscapularis tendon.
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tendon absents itself from the shoulder joint through the rotator cuff interval, it is easily possible to distinguish between the supraspinatus and the subscapularis tendon. Those two tendons build the interval sling.
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has arrived at the conclusion that through THI it is possible to achieve a generally improved visibility of joint and tendon surfaces, especially superior for subscapularis tendon abnormalities.
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Strobel, Klaus; Zanetti, Marco; Nagy, Ladislav; Hodler, Juerg (2004). "Suspected Rotator Cuff Lesions: Tissue Harmonic Imaging versus Conventional US of the Shoulder1".
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been associated with subscapularis tendon tears. Findings with cysts seem to be more specific and combined findings with cortical irregularities more sensitive.
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Barth, Johannes R.H.; Burkhart, Stephen S.; De Beer, Joe F. (October 2006). "The Bear-Hug Test: A New and Sensitive Test for Diagnosing a Subscapularis Tear".
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It is difficult to isolate the action of the subscapularis from other medial rotators of the shoulder joint; there is no satisfactory test for this muscle.
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Primarily in abdominal imaging, tissue harmonic imaging (THI) gets more and more valued and used additionally to conventional ultrasonography.
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Another fact typically for the subscapularis muscle is the fatty infiltration of the superior portions, while sparing the inferior portions.
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It arises from its medial two-thirds of the costal surface of the scapula, the intermuscular septa (which create ridges upon the scapula),
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Morag, Yoav; Jamadar, David A.; Miller, Bruce; Dong, Qian; Jacobson, Jon A. (2009). "The subscapularis: Anatomy, injury, and imaging".
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The muscle's fibers pass laterally from its origin before coalescing into a tendon of insertion. The tendon intermingles with the
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The subscapularis stabilises the shoulder joint by contributing to the fixation of the proximal humerus during movements of the
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Some fibers arise from tendinous laminae, which intersect the muscle and are attached to ridges on the bone; others from an
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The following sectional planes are defined for the sonographic examination of the different shoulder joint structures:
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Thelen M. et al.. Radiologische Diagnostik der Verletzungen von Knochen und Gelenken. Stuttgart . Georg Thieme. 1993.
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Mack, L A; Matsen, F A; Kilcoyne, R F; Davies, P K; Sickler, M E (1985). "US evaluation of the rotator cuff".
1730: 1687: 1654: 1503: 1498: 1439: 730: 286: 1399: 386:/the neck of the scapula. The subscapularis (supraserratus) bursa separates the subscapularis is from the 1404: 1207: 860: 757: 1817: 298: 229: 1735: 1493: 1429: 1263: 1666: 1649: 84: 1550: 1225: 463: 459: 221: 217: 213: 209: 37: 1720: 1704: 1582: 1394: 1253: 447: 274: 262: 1857: 1615: 1572: 1389: 450:. Tendinous fibers extend to the greater tubercle with insertions into the bicipital groove. 1587: 1142: 1137: 484:
The subscapularis medially (internally) rotates the humerus (acting here as a prime mover)
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Knowledge articles incorporating text from the 20th edition of Gray's Anatomy (1918)
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Same as the left, but the bones around the muscle are shown as semi-transparent.
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MRI. Partial rupture of the cranial subscapularis tendon at the insertion site
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The subscapularis is difficult to see from the front (labeled middle right)
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at the margins of the subscapularis' attachment (origin) on the scapula.
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Intertubercular sulcus with long head of biceps brachii (transversal)
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belly press tests indicate significant tearing of subscapularis.
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Intertub. sulcus with long head of biceps brachii (longitudinal)
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Longitudinal plane of the musculus subscapularis and its tendon
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Arthroscopy: The Journal of Arthroscopic and Related Surgery
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Transverse section of thorax featuring subscapularis muscle
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In comparison to a checking MR Arthrography Strobel K.
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Katthagen BD. et al.. Schultersonographie. Stuttgart.
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and adducts it. When the arm is raised, it draws the
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Animation. 401:and the lower two-thirds of the groove on the 1088: 831:Shoulder Arthroscopy: Principles and Practice 514:It is a powerful defense to the front of the 857: 1095: 1081: 797: 663: 147: 131: 111:Learn how and when to remove this message 550: 525: 347:The subscapularis is covered by a dense 1840: 1102: 861:"Physical examination of the shoulder" 752:This article incorporates text in the 420:, which separates the muscle from the 235:Internally rotates and adducts humerus 1076: 829:Milano, Giuseppe and Grasso, Andrea, 793: 791: 789: 787: 785: 783: 781: 779: 777: 775: 458:The subscapularis is supplied by the 16:Large triangle muscle of the shoulder 825: 823: 821: 819: 686: 479: 335:and the front of the capsule of the 49:adding citations to reliable sources 20: 736:Diagram of the human shoulder joint 639:supraspinatus muscle (transversal) 636:infraspinatus muscle (longitudinal) 630:supraspinatus muscle (longitudinal) 621:subscapularis muscle (longitudinal) 13: 872:from the original on 20 April 2017 772: 633:supraspinatus muscle (transversal) 624:subscapularis muscle (transversal) 574: 14: 1874: 1068: 816: 802:(12th ed.). pp. 44โ€“45. 1825: 746: 729: 717: 705: 693: 25: 983:10.1148/radiology.157.1.3898216 137:Subscapularis muscle (in red). 36:needs additional citations for 1483:extensor carpi radialis longus 1410:flexor digitorum superficialis 1029: 1013: 997: 962: 919: 884: 851: 530: 453: 141:are shown as semi-transparent. 1: 741: 610:Lateral transversal/sagittal: 446:and the anterior part of the 905:10.1016/j.arthro.2006.05.005 522:of the head of the humerus. 431: 342: 7: 1693:flexor digiti minimi brevis 798:Sinnatamby, Chummy (2011). 760:of the 20th edition of 494: 10: 1879: 1435:flexor digitorum profundus 546: 299:Anatomical terms of muscle 1853:Muscles of the upper limb 1780: 1755: 1746: 1713: 1675: 1637: 1628: 1603: 1563: 1512: 1461: 1452: 1418: 1378: 1369: 1354: 1317: 1272: 1244: 1216: 1201: 1168: 1123: 1114: 1050:10.1148/radiol.2301021517 940:10.1007/s00256-009-0845-0 466:(C5-C6), branches of the 424:and the long head of the 393: 297: 285: 273: 261: 249: 244: 228: 203: 191: 175: 163: 158: 146: 130: 125: 1863:Shoulder medial rotators 1660:abductor pollicis brevis 1544:extensor pollicis longus 1539:extensor pollicis brevis 1534:abductor pollicis longus 604:Ventral sagittal lateral 464:lower subscapular nerves 664:Tissue harmonic imaging 601:Ventral sagittal medial 379:via an aperture in the 362:glenohumeral (shoulder) 214:lower subscapular nerve 210:Upper subscapular nerve 1698:abductor digiti minimi 1688:opponens digiti minimi 1655:flexor pollicis brevis 1504:extensor carpi ulnaris 1499:extensor digiti minimi 1440:flexor pollicis longus 848:. Accessed 2016-11-07. 556: 491:forward and downward. 448:shoulder-joint capsule 351:which attaches to the 319:is a large triangular 256:musculus subscapularis 60:"Subscapularis muscle" 1573:bicipital aponeurosis 1400:flexor carpi radialis 836:27 April 2021 at the 554: 526:Clinical significance 327:and inserts into the 1767:extensor retinaculum 1405:flexor carpi ulnaris 436:It inserts onto the 126:Subscapularis muscle 45:improve this article 1595:antebrachial fascia 1529:anatomical snuffbox 1340:triangular interval 1297:intermuscular septa 1189:infraspinous fascia 1184:supraspinous fascia 598:Ventral transversal 1797:palmar aponeurosis 1792:flexor retinaculum 1772:extensor expansion 1616:osborne's ligament 1494:extensor digitorum 1430:pronator quadratus 1330:quadrangular space 1264:articularis cubiti 928:Skeletal Radiology 613:Dorsal transversal 557: 198:Subscapular artery 1813: 1812: 1809: 1808: 1805: 1804: 1667:adductor pollicis 1650:opponens pollicis 1624: 1623: 1559: 1558: 1448: 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"Subscapularis muscle"
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Ribs

Origin
Subscapular fossa
Insertion
Lesser tubercle
humerus
Artery
Subscapular artery
Nerve
Upper subscapular nerve
lower subscapular nerve
C5
C6
Actions
Internally rotates and adducts humerus
shoulder
Latin

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