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Traps, Lats, Levator Scapula, Rhom major & minor / Serratus posterior sup & inf

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Muscle
Origin
Insertion
Nerve
Action
Rhomboid major   PA: SP of T2-T5   medial border of the scapula from the spine to the inferior angle   Dorsal scapular nerve (C 4-5)   Retract scapula and rotate the scapula in downward direction to depress the glenoid cavity, fix scapula to the thorax; can assist with elevation of scapula with L. S  
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Rhomboid minor   PA: nuchal ligament & SP of C7 + T1   medial border of the scapula from the spine to the inferior angle   Dorsal scapular nerve (C 4-5)   Retract scapula and rotate the scapula in downward direction to depress the glenoid cavity, fix scapula to the thorax; can assist with elevation of scapula with L. S  
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Serratus posterior superior   SA: Ligamentum nuchae, SP of C7-T3   IA: Superior borders of ribs 2-4   2nd - 5th intercostal nerves   Elevate ribs  
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Serratus posterior inferior   SA: SP of T11-L2   IA: Inferior borders of ribs 8-12 near angles   Ventral rami of 9th - 12th thoracis spinal nerves   Depress ribs  
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Trapezius   SA: medial 1/3 of superior nuchal line, external occipital protuberance, ligamentum nuchae, SP of C7-T12   IA: lateral 1/3 of clavicle, acromion, spine of scapula   Spinal Accessory Nerve (CN XI)   Upper fibers: elevate scapulaMiddle fibers: retract scapulaLower fibers: depress scapula  
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Latissimus dorsi   PA: SP of inferior 6 thoracic vertebrae, thoracolumbar fascia, iliac crest, inferior 3-4 ribs   DA: floor of intertubercular groove of the humerus   Thoracodorsal nerve (C6-8)   Extends, adducts, and medially rotates the humerus  
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Levator scapula   PA: Posterior tubercles of transverse processes of C1-C4   DA: Superior aspect of the medial border of the scapula   Dorsal scapular nerve (C5) & cervical (C3, C4) nerves   Elevates scapula and tilts the glenoid cavity inferiorly by rotating the scapula in downward direction  
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