SpineThoraxMm.

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Author:
rustemk
ID:
1661
Filename:
SpineThoraxMm.
Updated:
2009-11-25 10:41:06
Tags:
Spine and Thorax muscles
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Description:
I,A,O,N of the Spine and Thorax muscles
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  1. Spinalis Thoracis
    • Origin: Spinous processes of upper lumbar and lower thoracic vertebrae
    • Insertion: Spinous processes of upper thoracic
    • Innervation: Dorsal primary divisions of spinal nn.
    • Actions: Bilaterally extends vertebral column, unilaterally flexes vertebral column to the same side (ipsilateral flexion)
  2. Spinalis Cervicis
    • Origin: Common tendon, Ligamentum nuchae, spinous process of C7
    • Insertion: Spinous processes of cervicals, except C1
    • Innervation: Dorsal primary divisions of spinal nn.
    • Actions: Bilaterally extends vertebral column, unilaterally flexes vertebral column to the same side (ipsilateral flexion)
  3. Longissimus Thoracis
    • Origin: Lower ribs between tubercle and angle
    • Insertion: Transverse processes of thoracic vertebrae
    • Innervation: Dorsal primary divisions of spinal nn.
    • Actions: Bilaterally extends vertebral column, unilaterally flexes vertebral column to the same side (ipsilateral flexion)
  4. Longissimus Cervicis
    • Origin: Transverse processes of upper five thoracic vertebrae
    • Insertion: Transverse processes of cervical vertebrae
    • Innervation: Dorsal primary divisions of spinal nn.
    • Actions: Bilaterally extends vertebral column, unilaterally flexes vertebral column to the same side (ipsilateral flexion)
  5. Longissimus Capitis
    • Origin: Transverse processes of upper five thoracic vertebrae
    • Insertion: Mastoid process of temporal bone
    • Innervation: Dorsal primary divisions of spinal nn.
    • Actions: Bilaterally extends vertebral column, unilaterally flexes vertebral column to the same side (ipsilateral flexion)
  6. Iliocostalis Lumborum
    • Origin: Common tendon
    • Insertion: Transverse processes of lumbar vertebrae 1-3 and posterior surface of ribs 6-12
    • Innervation: Dorsal primary divisions of spinal nn.
    • Actions: Bilaterally extends vertebral column, unilaterally flexes vertebral column to the same side (ipsilateral flexion)
  7. Iliocostalis Thoracis
    • Origin: Posterior surface of ribs 1-12
    • Insertion: posterior surface of ribs 1-6
    • Innervation: Dorsal primary divisions of spinal nn.
    • Actions: Bilaterally extends vertebral column, unilaterally flexes vertebral column to the same side (ipsilateral flexion)
  8. Iliocostalis Cervicis
    • Origin: Posterior surface of ribs 1-12
    • Insertion: Transverse processes of lower cervicals
    • Innervation: Dorsal primary divisions of spinal nn.
    • Actions: Bilaterally extends vertebral column, unilaterally flexes vertebral column to the same side (ipsilateral flexion)
  9. Multifidi and Rotatores
    • Origin: Sacrum and transverse processes of lumbar through cervical vertebrae
    • Insertion: Spinous processes of lumbar vertebrae through second cervical vertebrae
    • Innervation: Dorsal primary divisions of spinal nerves
    • Actions: Extend vertebral column, rotate vertebral column to opposite side (contralateral)
  10. Semispinalis
    • Origin: Transverse processes of thoracic vertebrae, articular processes of lower cervicals
    • Insertion: Spinous processes of upper thoracic, cervicals (except C1), and superior nuchal line of occiput
    • Innervation: Dorsal primary divisions of spinal nerves
    • Actions: Extend the vertebral column and head
  11. Splenius Capitis
    • Origin: Ligamentum nuchae, spinous processes of C7-T3
    • Insertion: Mastoid process, lateral nuchal line
    • Innervation: Branches of dorsal division of cervical n.
    • Actions: Unilaterally rotates head to same side (ipsilateral), laterally flexes head and neck; bilaterally extends head and neck
  12. Splenius Cervicis
    • Origin: Spinous processes of T3-T6
    • Insertion: Transverse processes of upper cervical vertebrae
    • Innervation: Branches of dorsal division of cervical n.
    • Actions: Actions: Unilaterally rotates head to same side (ipsilateral), laterally flexes head and neck; bilaterally extends head and neck
  13. Rectus Capitis Posterior Major
    • Origin: Spinous process of axis (C2)
    • Insertion: Inferior nuchal line of occiput
    • Innervation: Suboccipital n.
    • Actions: Rock and tilt head back into extension, rotate head to same side (ipsilateral)
  14. Rectus Capitis Posterior Minor
    • Origin: Tubercle of the posterior arch of the atlas (C1)
    • Insertion: Inferior nuchal line of occiput
    • Innervation: Suboccipital n.
    • Actions: Rock and tilt head back into extension
  15. Obliquous Capitis Superior
    • Origin: Transverse process of atlas (C1)
    • Insertion: Between nuchal lines of occiput
    • Innervation: Suboccipital n.
    • Actions: Rock and tilt head back into extension
  16. Obliquous Capitis Inferior
    • Origin: Spinous process of axis (C2)
    • Insertion: Transverse process of atlas (C1)
    • Innervation: Suboccipital n.
    • Actions: Rotate head to same side (ipsilateral)
  17. Intercostals
    • Origin: Inferior border of rib above
    • Insertion: Suiperior border of rib below
    • Innervation: Intercostal nn.
    • Actions: External - draw ventral part of ribs upward, increasing space of thoracic cavity; Internal - draw ventral part of ribs downward, decreasing space of thoracic cavity

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