13.2 extrinsic spinal muscles

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Author:
itzlinds
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264945
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13.2 extrinsic spinal muscles
Updated:
2014-03-03 21:23:24
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spinal
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13.2 extrinsic muscles acting on the spinal column
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13.2 extrinsic muscles acting on the spinal column
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  1. what is the origin of the rectus abdominis:
    • pubis crest
    • pubic symphysis
  2. what is the insertion of the rectus abdominis:
    • costal cartilage of the 5th-7th ribs
    • xiphoid process of the sternum
  3. what are the 2 actions of the rectus abdominis:
    • flexion of the lumbar spine against gravity
    • posterior rotation of the pelvis
  4. what is the origin of the external oblique
    • 5th - 8th ribs (anterior fibers)
    • 9th- 12th ribs (lateral fibers)
  5. what is the insertion of the external obliques:
    • via an aponeurosis to the linea alba (anterior fibers)
    • anterior superior iliac spine, pubic tubercle, and the anterior portion of the iliac crest (lateral fibers)
  6. what are the actions of the external obliques:

    bilateral:
    unilateral:
    • bilateral
    • flexion of the lumbar spine
    • posterior rotation of the pelvis

    • unilateral
    • rotation of the lumbar spine to the opposite side
    • lateral bending of the lumbar spine to the same side
  7. what is the origin of the internal obliques:
    • lateral 2/3 of the inguinal ligament (lower fibers)
    • anterior 1/3 of the iliac crest (upper fibers)
    • middle 1/3 of the iliac crest (lateral fibers)
  8. what is the insertion of the internal obliques:
    • crest of the pubis, pectineal line (lower fibers)
    • 10th- 12th ribs (lateral fibers)
    • linea alba (all portions)
  9. what is the actions of the internal obliques:

    bilateral:
    unilateral:
    • bilateral
    • support of the abdominal viscera
    • posterior rotation of the pelvis
    • flexion of the lumbar spine

    • unilateral
    • rotation of the lumbar spine to the same side
    • lateral bending of the lumbar spine to the same side
  10. what is the origin of the latissimus dorsi:
    • spinous processes of the T6-T12 and the lumbar vertebrae via the thoracodorsal fascia
    • posterior iliac crest
  11. what is the insertion of the latissimus dorsi:
    intertubercular groove of the humerus
  12. what is the 3 actions of the latissimus dorsi:
    • extension of the spine
    • anterior rotation of the pelvis (also see shoulder fxn)
    • stabilization of the lumbar spine via the thoracodorsal fascia
  13. what is the origin of the trapezius (middle 1/3):
    • lower portion of the ligamentum nuchae
    • spinous processes of the 7th cervical vertebra and T1- T5
  14. what is the insertion of the trapezius (middle 1/3):
    • acromion process
    • spine of the scapula (superior,lateral border)
  15. what are the 2 actions of the trapezius:
    • retraction of scapula
    • fixation of thoracic spine
  16. what is the origin of the trapezius (lower 1/3):
    spinous processes and supraspinal ligaments of T8 -  T12
  17. what is the insertion of the trapezius (lower 1/3):
    spine of the scapula (medial portion)
  18. what are the 4 actions of the trapezius (lower 1/3):
    • depression of the scapula
    • retraction of the scapula
    • upward rotation of the scapula 
    • fixation of the thoracic spine
  19. what is the origin of the rhomboids major:
    spinous process of T2, T3, T4, and T5
  20. what is the insertion of the rhomboid major:
    vertebral border of scapula (lower 2/3rds)
  21. what are the 4 actions of the rhomboid major:
    • retraction of the scapula
    • elevation of the scapula
    • downward rotation of the scapula
    • fixation of the thoracic spine
  22. what is the origin of the rhomboid minor:
    • inferior portion of the ligamentum nuchae
    • spinous processes C7 and T1
  23. what is the insertion of the rhomboids minor:
    vertebral border of scapula (upper 1/3rd and superior angle)
  24. what are the 4 actions of the rhomboid minor:
    • retraction of the scapula
    • elevation of the scapula
    • downward rotation of scapula 
    • fixation of thoracic spine

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