Superficial Back muscles

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Author:
Anonymous
ID:
87608
Filename:
Superficial Back muscles
Updated:
2011-05-24 21:38:08
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Gross Anatomy
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Description:
superficial back muscles
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  1. Latissimus dorsi muscle
    • Origin: Spinous processes of T7 to sacrum
    • Inferior angle of scapula
    • Iliac crest
    • Lower (10-12) ribs
    • Thoracolumbar fascia
    • Insertion: Lesser tubercular of the humerus
    • Ridge and intertubercular sulcus of the humerus
    • Innervation: thoracodorsal nerve (C6-C8)
    • Function: Extension
    • Adduction
    • Medial rotation of humerus
  2. Serratus posterior superior muscle
    • Origin: spinous processes of C7-T3
    • Insertion: 2-5 ribs
    • Innervation: intercostal nerves
    • anterior rami of T2-T5 thoracic nn
    • Function: respiration
    • Elevate ribs
  3. Rhomboid minor muscle
    • Origin: ligamentum nuchae
    • Spinous process C7/ C7-T1
    • Insertion: vertebral border of scapula at root ofspine
    • Innervation: dorsal scapular nerve (C5)
    • Function: elevation of scapula
    • Retraction of scapula and shoulder
  4. Serratus posterior inferior muscle
    • Origin: spinous processes of T11-L3
    • Insertion: 9-12 ribs
    • Innervation: intercostal nerves
    • anterior rami of T9-T12 thoracic nn
    • Function: respiration
    • Depress ribs
  5. Rhomboid major muscle
    • Origin: spinous processes C7-T4 / T2-T5
    • Insertion: vertebral border of scapular below spine
    • Innervation: dorsal scapular (C5)
    • Function: elevation of scapula
    • Retraction of scapula and shoulder
  6. Levator scapulae muscle
    • Origin: transverse processes of C1-C4
    • Insertion: vertebral border of scapula above spine
    • Innervation: cervical nerves 3 and 4
    • Dorsal scapular nerve
    • Function: elevation of scapula
    • Retraction of scapula and shoulder
    • Downward rotates the scapula
  7. trapezius muscle
    • Origin: Medial 1/3 of superior nuchal line
    • External occipital protuberance
    • Ligamentum nuchae (dorsal edge) –
    • whole extension to C7
    • Spinous processes C7/T1-T12
    • Insertion: Lateral 1/3 of clavicle
    • Acromion
    • Spine of scapula
    • Tubercle of the spine
    • Innervation: cranial nerve XI (accessory nerve)
    • Proprioceptive fibers to spinal cord levels C3 & C4
    • Function: Elevation
    • Retraction
    • Rotation of scapula
    • Depresses scapula
  8. What is this?

    External occipital protuberance
  9. What is this?

    Mastoid process
  10. Spinous processes (vertebra prominens)
  11. What and where is ligamentum nachae?
    • It is a triangular, sheet-like structure in the median sagittal plane:
    • the base of the triangle is attached to the skull, from the external occipital protuberance to the foramen magnum
    • the apex is attached to the tip of the spinous process of vertebra C7
    • the deep side of the triangle is attached to the posterior tubercle of vertebra C1 and the spinous processes of the other cervical vertebrae
  12. What are the parts of the scapula?
  13. Where is thoracolumbar fasica?
    • The thoracolumbar fascia covers the deep muscles of the back and trunk. This facial layer is critical to the overall organization and integrity of this region:
    • superiorly, it passes anteriorly to the serratus posterior superior muscle and is continuous with the superficial lamina of the investing layer of cervical fascia in the neck
    • in the thoracic region, it covers the deep muscles and separates them from the muscles in the superficial and intermediate groups
    • medially, it attaches to the spinous processes of the thoracic vertebra and, laterally, to the angles of the ribs.
  14. What muscle is origin on the crest of the ilium?
    latissimus dorsi muscle
  15. What is the sacrum?
    the sacrum is a single bone that represents the five fused sacral vertebrae.
  16. What is this?

    Trapezius muscle
  17. what is this?

    Latissimus dorsi muscle
  18. What is this?

    Levator scapulae muscle
  19. What is this?

    Rhomboid major muscle
  20. What is this?

    Rhomboid minor muscle
  21. What is this?

    Serratus posterior superior muscle
  22. What is this?

    Serratus posterior inferior muscle
  23. Dorsal rami
  24. Greater occipital nerve
  25. Occipital artery
  26. What muscle does the accessory nerve innervate?
    trapezius muscle
  27. What nerve innervates the latissimus dorsi muscle?
    Thoracodorsal nerve
  28. What nerve innervates this/ these muscles?
    Dorsal scapular nerve
  29. What plexus runs under the trapezius?
    Transverse cervical artery and nerve
  30. If the accessory nerve was damaged, what would happen?
    The scapula would not be able to elevate, retract, depress or rotate
  31. What would happen if the thoracodorsal nerve was damaged?
    the latissimus dorsi would not be able to extend, adduct, or medially rotate the humerus

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