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Extrensic Int. Back

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

MuscleOriginInsertionNerveAction
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
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
Serratus posterior superior SA: Ligamentum nuchae, SP of C7-T3 IA: Superior borders of ribs 2-4 2nd - 5th intercostal nerves Elevate ribs
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
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
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
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
Created by: scptguy19