SHOULDER MUSCLES

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Author:
sandykillian
ID:
115776
Filename:
SHOULDER MUSCLES
Updated:
2012-01-03 16:31:19
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SHOULDER MUSCLES
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SHOULDER MUSCLES
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  1. Anterior Deltoid
    • Origin-Lateral 1/3 of clavicle
    • Insertion-Deltoid Tuberosity of humerus
    • Actions-Shoulder flexion, Hor. Add, IR of shoulder
  2. Middle Deltoid
    • Origin-Acromion of scapula, lateral surface
    • Insertion-Deltoid tuberosity of humerus
    • Actions-shoulder abd to 90 degrees
  3. Posterior Deltoid
    • Origin-Spine of scapula
    • Insertion-Deltoid tuberosity of humerus
    • Actions-shoulder extension, hor. abd, ER of shoulder, scaption of humerus
  4. Supraspinatus
    • Origin-supraspinous fossa of scapula
    • Insertion-Greater tubercle of humerus (superior facet)
    • Actions-shoulder abd, scaption of humerus, stabilize and depress head of humerus in glenoid fossa
    • Part of the Rotator Cuffs
  5. Infraspinatus
    • Origin-infraspinous fossa of scapula
    • Insertion-Greater tubercle of humerus (middle facet)
    • Actions-ER of shoulder, shoulder extension, stabilize and depress head of scapula in glenoid fossa of humerus
    • Part of the Rotator Cuffs
  6. Subscapularis
    • Origin-subscapular fossa of scapula
    • Insertion-lesser tubercle of humerus
    • Actions-IR of shoulder, shoulder add, stabilize and depress head of scapula in glenoid fossa of humerus
    • Part of the Rotator Cuffs
  7. Teres Minor
    • Origin-Upper 2/3 of axillary border of scapula
    • Insertion-Greater tubercle of humerus (inferior facet)
    • Actions-ER of shoulder, shoulder extension, stabilize and depress head of scapula in glenoid fossa of humerus
    • Part of the Rotator Cuffs
  8. Teres Major
    • Origin-inferior angle of scapula (dorsal surface), lower 1/3 of axillary border of scapula
    • Insertion-Medial lip of intertubercle grove of humerus
    • Actions-shoulder extension, IR of shoulder, shoulder add
    • Joins with Latissimus dorsi to form posterior border of the axilla
  9. Latissimus Dorsi
    • Origin-thoracolumbar aponeurosis, T7-T12 spinous processes, sacrum, iliac crest, lower 3 to 4 ribs, inferior angle of scapula
    • Insertion-intertubercular groove of humerus
    • Actions-shoulder extension, IR of shoulder, shoulder add, IR of scapula, assists depression of scapula
  10. Coracobrachialis
    • Origin-coracoid process of scapula
    • Insertion-middle 1/3 of medial surface of humeral shaft (opposite of deltiod tuberosity but larger area)
    • Actions-shoulder flexion, shoulder add
  11. Pectoralis Major
    • Origin-clavicular head-medial half of clavicle, sternocostal head-sternum, cartilages of superior 6 ribs, aponeurosis of external oblique muscle
    • Insertion-lateral lip of intertubercular groove of humerus
    • Actions-hor. add., shoulder IR, clavicular head-shoulder flexion, sternocostal head-shoulder extension, assists anterior tilt of scapula
  12. Serratus Anterior
    • Origin-lateral surface of upper 8 ribs
    • Insertion-vertebral border of scapula-anterior surface
    • Actions-scapular abd (protraction), lateral (upward) rotation of scapula, stabilizes scapula against chest wall, depression of scapula
  13. Middle Trapezius
    • Origin-C7-T3 spinous processes
    • Insertion-Spine of scapula
    • Actions-add (retraction) of scapula
  14. Lower Trapezius
    • Origin-T4-T12 spinous processes
    • Insertion-root of spine of scapula
    • Actions-depression of scapula, lateral (upward) rotation of scapula
  15. Rhomboids
    • Origin-C7-T5 spinous processes
    • Insertion-vertebral border of scapula, root of spine of scapula
    • Actions-add (retraction) of scapula, medial (upward) rotation of scapule

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