muscles of the back [3]

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muscles of the back [3]
2011-10-27 09:34:10
muscles back

muscles of the back (origin, insertion, innervation, action, and blood supply)
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  1. trapezius muscle origin
    external occipital protuberance, medial 3rd of superior nuchal line, nuchal ligament, spinous processes of C7 - T12 vertebrae
  2. trapezius muscle insertion
    lateral 3rd of clavicle, acromion, and spine of scapula
  3. trapezius muscle innervation
    spinal accessory nerve (motor)

    C3 & C4 (pain and proprioception)
  4. trapezius muscle action
    elevate, retract and rotate scapula
  5. trapezius muscle blood supply
    thoracic neurovascular bundles, and transverse cervical a, v.
  6. Rhomboid (Major and Minor) Origin
    1. Minor = nuchal ligament and spinous processes of C7 -T1 vertebrae

    2. Major = spinous processes of T2 - T5 vertebrae
  7. Rhomboid (Major and Minor) Insertion
    1. Minor = triangular area at medial end of scapular spine

    2. Major = medial border of scapula at level of spine to inferior angle of scapula
  8. Rhomboid (Major and Minor) Innervation
    (C4, C5) Dorsal Scapular Nerves
  9. Rhomboid (Major and Minor) Action
    fix scapula against thoracic wall

    rotate scapula to depress glenoid cavity of scapula

    retract scapula
  10. Rhomboid (Major and Minor) Blood Supply
    tributaries and branches from scapular anastamose; cervical neurovascular bundles
  11. Levator Scapulae Origin
    posterior tubercles of transverse processes C1 - C4 vertebrae
  12. Levator Scapulae Insertion
    medial border of scapula superior to root of scapular spine
  13. Levator Scapulae Innervation
    Dorsal Scapular (C5) and C3 & C4
  14. Levator Scapulae Action
    elevate scapula; tilt its glenoid cavity inferiorly by rotating scapula
  15. Levator Scapulae Blood Supply
    thyrocervical trunk

    jugular v.

    suprascapular a, v.
  16. Latissimus Dorsi Origin
    spinous processes of inferior 6 thoracic vertebrae

    thoracolumbar fascia

    iliac crest

    inferior 3 or 4 ribs
  17. latissimus dorsi insertion
    floor of the intertubercular groove (sulcus) of the humerus
  18. latissimus dorsi innervation
    thoracodorsal n. (C6, C7, C8)
  19. latissimus dorsi action
    extend, adduct, and medially rotate humerus

    raise body towards arms while climbing
  20. latissimus dorsi blood supply
    thoracodorsal a, v.
  21. Teres Major Origin
    posterior surface of inferior angle of scapula
  22. Teres Major Insertion
    medial lip of intertubercular sulcus of the humerus
  23. Teres Major Innervation
    (C5, C6) lower subscapular nerves
  24. Teres Major Action
    adduct and medially rotate the arm
  25. Teres Major blood supply
    scapular anastamose
  26. Teres Minor Origin
    middle part of lateral border of scapula
  27. Teres Minor Insertion
    inferior facet of greater tubercle of humerus
  28. teres minor innervation
    axillary n. (C5 & C6)
  29. teres minor action
    laterally rotate the arm

    helps hold the humeral head in the glenoid cavity of the scapula
  30. teres minor blood supply
    scapular anastamose