DEEP MUSCLES OF THE BACK

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iliac crest, sacrum, transverse and spinous processes of vertebrae and supraspinal ligament

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iliac crest, sacrum, transverse and spinous processes of vertebrae and supraspinal ligament

erector spinae origin

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angles of the ribs, transverse and spinous processes of vertebrae, posterior aspect of the skull

erector spinae insertion

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segmentally innervated by dorsal primary rami of spinal nerves c1-s5

erector spinae nerve supply

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extends and laterally bends the trunk, neck and head

erector spinae action

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iliac crest and sacrum

iliocostalis origin

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angles of the ribs

iliocostalis insertion

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dorsal primary rami of spinal nerves c4-s5

iliocostalis nerve supply

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extends and laterally bends trunk and neck

iliocostalis action

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upper border of spinous process

interspinales origin

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lower border of spinous process above

interspinales insertion

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dorsal primary rami of spinal nerves c1-l5

interspinales nerve supply

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extend trunk and neck

interspinales action

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upper border of transverse process

intertransversarii origin

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lower border of transverse process above

intertransversarii insertion

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dorsal primary rami of spinal nerves c1-l5

intertransversarii nerve supply

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laterally bend trunk and neck

intertransversarii action

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transverse process at inferior vertebral levels

longissimus origin

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transverse process at superior vertebral levels and mastoid process

longissimus insertion

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dorsal primary rami of spinal nerves c1-s1

longissimus nerve supply

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extends and laterally bends the trunk, neck and head

longissimus action

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sacrum, transverse processes of c3-l5

multifidus origin

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spinous processes 2-4 vertebral levels superior to their origin

multifidus insertion

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dorsal primary rami of spinal nerves c1-l5

multifidus nerve supply

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extend and laterally bend trunk and neck, rotate to opposite side

multifidus action

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spinous process of the axis

obliquus capitis inferior origin

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transverse process of atlas

obliquus capitis inferior insertion

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suboccipital nerve (dpr of c1)

obliquus capitis inferior nerve supply

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rotates the head to the same side

obliquus capitis inferior action

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transverse process of atlas

obliquus capitis superior origin

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occipital bone above inferior nuchal line

obliquus capitis superior insertion

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suboccipital nerve (dpr of c1)

obliquus capitis superior nerve supply

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extends the head, rotates the head to the same side

obliquus capitis superior action

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spinous process of axis

rectus capitis posterior major origin

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inferior nuchal line

rectus capitis posterior major insertion

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suboccipital nerve (dpr of c1)

rectus capitis posterior major nerve supply

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extends the head, rotate to same side

rectus capitis posterior major action

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posterior tubercle of atlas

rectus capitis posterior minor origin

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inferior nuchal line medially

rectus capitis posterior minor insertion

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suboccipital nerve (dpr of c1)

rectus capitis posterior minor nerve supply

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extends the head

rectus capitis posterior minor action

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transverse processes

rotatores origin

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long rotatores: spines 2 vertebrae above origin; short rotatores: spines 1 vertebrae above origin

rotatores insertion

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dorsal primary rami of spinal nerves c1-l5

rotatores nerve supply

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rotates the vertebral column to the opposite side

rotatores action

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transverse processes of c7-t12

semispinalis origin

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capitis: back of skull between nuchal lines; cervicis & thoracis: spines 4-6 vertebrae above origin

semispinalis insertion

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dorsal primary rami of spinal nerves c1-t12

semispinalis nerve supply

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extends the trunk and laterally bends the trunk, rotates the trunk to the opposite side

semispinalis action

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thoracolumbar fascia, spines of vertebrae t11-t12 and l1-l2

serratus posterior inferior origin

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ribs 9-12, lateral to the angles

serratus posterior inferior insertion

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branches of the ventral primary rami of spinal nerves t9-t12

serratus posterior inferior nerve supply

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pulls down lower ribs

serratus posterior inferior action

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ligamentum nuchae, spines of vertebrae c7 and t1-t3

serratus posterior superior origin

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ribs 1-4, lateral to the angles

serratus posterior superior insertion

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branches of the ventral primary rami of spinal nerves t1-t4

serratus posterior superior nerve supply

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elevates the upper ribs

serratus posterior superior action

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spinous processes at inferior vertebral levels

spinalis origin

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spinous processes at superior vertebral levels and base of the skull

spinalis insertion

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dorsal primary rami of spinal nerves c2-l3

spinalis nerve supply

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extends and laterally bends trunk and neck

spinalis action

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ligamentum nuchae and spines c7-t6

splenius origin

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capitis: mastoid process & superior nuchal line laterally; cervicis: posterior tubercles of c1-c3 vertebrae

splenius insertion

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dorsal primary rami of spinal nerves c2-c6

splenius nerve supply

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extends and laterally bends neck and head; rotates head to same side

splenius action

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ligamentum nuchae and spines of c7-t6 vertebrae

splenius capitis origin

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mastoid process and lateral end of the superior nuchal line

splenius capitis insertion

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dorsal primary rami of spinal nerves c2-c6

splenius capitis nerve supply

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extends and laterally bends the neck and head, rotates head to the same side

splenius capitis action

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ligamentum nuchae and spines of c7-t6 vertebrae

splenius cervicis origin

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posterior tubercles of the transverse processes of c1-c3 vertebrae

splenius cervicis insertion

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dorsal primary rami of spinal nerves c2-c6

splenius cervicis nerve supply

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extends and laterally bends neck and head, rotates head to the same side

splenius cervicis action

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