Back Muscles

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Back Muscles
2012-01-09 15:24:56

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  1. What is the origin of the Rectus Capitis Posterior Major?
    • Spinous process of C2.
    • Posterior tubercle of C1.
  2. What is the insertion point for Rectus Capitis Posterior Major? Minor?
    • Inferior nuchal line on Occipital Bone.
    • Inferior nuchal line on OB.
  3. What is the motor innervation for the RCPMajor? Minor?
    • Suboccipital Nerve (C1 posterior ramus)
    • Suboccipital Nerve (C1 posterior ramus)
  4. What are the actions of the RCPMajor? Minor?
    • Unilaterally to turn to one side, bilaterally extend the head.
    • Unilaterally to turn to one side, bilaterally extend the head.
  5. What is the O, I, M, and A of Obliquus Capitis Superior?
    • Transverse Process of C1
    • Occipital bone, inbetween superior and inf nuchal lines
    • Suboccipital nerve (C1 posterior ramus)
    • entend head
  6. What is the O, I, M, and A of Obliquus Capitis Inferior?
    • Spinous Process of C2
    • Transverse Process of C1
    • Suboccipital Nerve
    • Rotate head to one side
  7. What 3 muscles make up the Suboccipital Triangle?
    The superloateral is the Obliquus Capitis Superior, the supermedial is the Rectus Capitis Major, and the inferior is the Obliquus Capitis Inferior.
  8. What muscles rotate the head in the ipsilater (same side) direction?
    • Obliquus Capitis Inferior
    • Rectus Capitis Major and Minor
  9. Longissimus Capitis
    Splenius Capitis
  10. What muscles rotate the head in the contralateral direction?
    • Sternocleidomastoid
    • Semispinalis Capitis
  11. What action does the Obliquus Capitis Superior do?
    extends the head
  12. Is Splenius part of the intrinsic or extrinsic?
  13. What is the Proximal and Distal attachment of the Splenius?
    • P: nuchal ligament, Spinous Process of C7 - T4
    • D: Transverse P of C1 - 4, superior nucal line of occ bone, mastoids of skull
  14. What are the distal attachments of the Erector Spinae for each level.
    • iliocostals - angles of lower ribs, cervical trans process
    • longissimus - posterior ribs, C and T trans process, mastoids of temporal bone
    • spinalis - C and T trans process
  15. What is the deepest layer of the Deero (Intrinsic) Muscles?
    • Transversospinalis
    • - Multifudus
    • - Rotatores
    • and
    • - Semispinalis
    • MR are together bound
  16. What are the P and D attachments of these transversospinalis?
    • P - transverse processes
    • D - superior spinous processes of superior vertebrae
  17. What muscles elevate the ribs?
    Serratus Posterior Superior Muscles, the intermediate extrinsic muscles, then to depress would be the Serratus Posterior Inferior Muscles.
  18. What is the P and D for Serratus Posterior Superior?
    • P - SP of C7 - T3
    • D - superior aspect of rib 2 - 4

    M would be Ant rami via intercostal nerve
  19. What is the P and D for Serratus Posterior Inferior?
    • P - SP of T 11 - L2
    • D - Ribs 8 - 12, inferior boarder

    same M = anterior rami, via intercostal nerve
  20. P, D, M, A of Trapezius
    • P - nuchal ligament, superior nuchal line, external occipital protuberance, SP of C7 - T12
    • * think all of T spine

    • D - lateral clavicle, acromion, spine of scapula
    • M - CN 11 - spinal accessory nerve
    • A - descending - elevate the scapula, ascending would depress the scapula, middle could retract (maybe with others as well) and the desc and ascending would make it superiorly rotate
  21. P, D, M, A of Latissimus Dorsi
    • P - SP processes, thoracolumbar fascia, iliac crest
    • D - floor of intertubercular groove of humerus
    • M - Thoradorsal nerve (C6, 7, 8)
    • A - extend, medial rotate, adducts humerus
  22. P, D, M, A of Levator Scapulae
    • P - Transverse processes C1 - C4
    • D - medial border of scapula, superior to spine of scapula
    • M - Dorsal Scapular nerve C5
    • A - elevates scapula, inferiorly rotates scapula
  23. What 4 muscles make up the superficial extrinsic back muscles?
    Trapezius, Rhomboid Major and Minor, Latissimus Dorsi, Levator Scapulae
  24. P, D, M, A of Rhomboid Major and Minor
    • P - Major - spinous process of T2 - T5
    • Minor - nuchal ligament, spinous process C7 - T1
    • D - Major - medial border of scapula inferior to spine
    • Minor - medial border of scapular @ spine
    • M - dorsal scapular nerve C4, C5
    • A - Retracts scapular, inferiorly rotates scapula
  25. What is the action of the Extrinsic Muscles?
    Movement of upper limb and assists in respiration.
  26. What are the actions of the Intrinsic Muscles?
    Movement of vertebral column, maintain posture.