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Origins Insertions And Actions of Muscles of the back

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kodopumi's version from 2015-12-09 20:17

Origins Insertions And Actions of Muscles of the Back

 

MuscleOriginInsertionAction
Trapeziusthe occipital bones, spines of 7th vertebrae, and all thoracic vertebraeon clavicle, acromion process of scapula and spine of scapulamoves head back, elevates the scapula (shrugs shoulders), adducts scapula, and braces shoulder
Deltoidon acromion process of scapula, spine of scapula and clavicleon deltoid tuberosity of the humerusabducts arm, extends or flexes humerus
Supraspinatuson supraspinous fossa of scapulaon greater tubercle of humerusabducts and laterally rotates the humerus
Infrapspinatuson infraspinous fossa of scapulaon greater tubercle of humerusrotates arm laterally
Teres majoron axillary border of scapulaon lesser tubercle of humerusextends humerus, adducts and rotates arm medially
Teres minoron lateral border of scapulaon greater tubercle of humerusrotates arm laterally
Latissimus Dorsion spines of sacral, lumbar, and lower thoracic vertebrae, iliac crest, and lower four ribson intertubercular groove of the humerusextends, adducts and rotates humerus medially; retracts the shoulder
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