Back Muscles

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Author:
emm64
ID:
103576
Filename:
Back Muscles
Updated:
2011-09-22 11:57:50
Tags:
gross anatomy back muscles
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Description:
back muscles attacments innervation actions
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  1. Trapezius
    • attach: occipital bone, ligamentum nuchae, C7-T12 vert., clavicle, acromion and spine of scapula
    • innerv: spinal accessory n. (CN XI)
    • action:
    • superior fibers elevate scapula
    • middle fibers retract scapula
    • inferior fibers depress scapulae
    • superior & inferior fibers together cause upward or superior rotation of scapula
  2. Rhomboids (Major and Minor together)
    • attach: ligamentum nuchae, C7-T5 vert., scapula - medial border from spine to inferior angle
    • innerv: dorsal scapular n.
    • action: retracts, inferiorly rotates, and stabilizes scapula
  3. Levator Scapulae
    • attach: C1-C4 vert., scapula - supero-medial border
    • innerv: dorsal scapular n.
    • action: elevates & inferiorly rotates scapula
  4. Latissimus Dorsi
    • attach: T7-T12 vert., thoracolumbar fascia, ribs 10-12, iliac crest, humerus - bicipital or intertubercular groove
    • innerv: thoracodorsal n.
    • action: extends, adducts, & medially rotates humerus
  5. Serratus Posterior Superior
    • attach: C7-T3 vert., ligamentum nuchae, ribs 2-5 (2 vertebrae up)
    • innerv: T1-T3 intercostal (ventral rami) nerves
    • action: elevates ribs (accessory muscle of respiration)
  6. Serratus Posterior Inferior
    • attach: T11-L2 vert., thoracolumbar fascia, ribs 9-12 (2 vertabrae down)
    • innerv: T10-T12 intercostal nerves
    • action: depresses ribs (accessory muscle of respiration)
  7. Splenius Capitis
    • attach: ligamentum nuchae, C7 - T4 vert., mastoid process & occipital bone
    • innerv: dorsal rami nerves.
    • action: extend & laterally bend (or flex) the neck
  8. Splenius Cervicis
    • attach: T3-T6 spinous processes, C1-C4 transverse processes
    • innerv: dorsal rami nerves
    • action: extend & laterally bend (or flex) the neck
  9. Erector Spinae (iliocostalis, longissimus, and spinalis together)
    • attach: cervical, thoracic, inf. lumbar vertebrae, sacrum, iliac crest, ribs, mastoid process (of temporal bone)
    • innerv: dorsal rami of spinal nerves.
    • action: extend the vertebral column and head & laterally bend/flex the vertebral column
  10. Transversospinales Group (semispinalis, multifidus, rotatores together)
    • attach: transverse processes & spinous processes of vertebrae
    • innerv: dorsal rami of spinal nerves
    • action: extend, laterally bend (or flex), rotate, and stabilize the vertebral column
  11. Interspinalis and Intertransverse muscles
    • attach: between spinous processes (interspinalis); between transverse processes (intertransverse)
    • innerv: dorsal rami of spinal nerves
    • action: aids in extension and rotation of vertebral column (interspinales); aids in lateral
    • bending and stabilizing vertebral column (intertransverse)
  12. superficial back muscles diagram

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