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Shoulder Muscles: Part 2

Shoulder Muscles: Part 2. Taelar Shelton, MS, ATC, AT/L. Deltoid. O: Lateral 1/3 of clavicle, acromion , spine of scapula I: Deltoid Tuberosity A: Abduction, flexion, internal rotation, external rotation of the humerus. Latissimus Dorsi.

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Shoulder Muscles: Part 2

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  1. Shoulder Muscles: Part 2 Taelar Shelton, MS, ATC, AT/L

  2. Deltoid • O: Lateral 1/3 of clavicle, acromion, spine of scapula • I: Deltoid Tuberosity • A: Abduction, flexion, internal rotation, external rotation of the humerus

  3. LatissimusDorsi • O: Spinous processes of lower 6 thoracic vertebra, lower ribs, iliac crest, inferior angle of scapula • I: intertubercular groove • A: extension, adduction, internal rotation of the humerus, depresses scapula

  4. Levator Scapula • O: Transverse processes of C1-C4 • I: medial border of scapula, between superior angle and the root of the spine of the scapula • A: Elevates and adducts the scapula

  5. Pectoralis Major • O: Clavicle, sternum, cartilage of ribs 1-6 • I: Greater tubercle of the humerus • A: flexion, internal rotation and adduction of the humerus

  6. Pectoralis Minor • O: anterior surface of ribs 3-5 • I: coracoid process • A: draws scapula forward and downward

  7. Trapezius O: occipital bone, ligamentumnuchae and the spinous processes of C7 and T1-T12 I: Along the acromium, spine of the scapula and the lateral 1/3 of the clavicle A: stabilizes, raises, retracts and rotates scapula upward

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