Muscle Origin Insertion Action
Trapezius(upper) External part of occipiatal bone, C7 Lateral 1/3 of clavicle and acromion Elevates scapula, rotates sc apula upwards, retracts scapula
Trapezius(middle) Spinous process of T1-T5 Superior border of spine of scapula Retracts and elevates scapula
Trapezius(lower) Spinous process of T6-T12 Medial 1/3 of spine of scapula Depresses scapula, retracts scapula, rotates scapula upwwards, stabilizatio of scapula
Levator scapulae Transverse process C1-C4 Border of scapula between superior angle and spine of scapula Elevates scapula, rotates scapula downwards, elevates and retracts scapula
Rhomboid major spinous processes of T2-T5 Medial border of scapula from spine of scapula to interior angle Retracts and elevates scapula
Rhomboid minor Spinous processes of C7-T1 Medial border of scapula Retracts and elevates scapula, rotates scapula downwards
Serratus anterior Superior lateral surfaces of uupper 8 or 9 ribs at side of chest Costal surface of vertebral border alongn inferior angle of scapula Protracts scapula, rotates scapula upwards
Pectoralis minor Anterior surface of 3-5th ribs Coracoid process of scapula Depresses scapula, rotates scapula downwards, anterior shoulder stabilizer
Subcalvius First rib Inferior surface of clavicle Depresses clavicle, pulls clavicle inferiorlyl and anteriorly