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erector spinae muscles are
- spinalis
- longissimus
- iliocostalis
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origin of erector spinae group
- common tendon (thoracolumbar aponeurosis) that attaches to the posterior surface of sacrum,
- iliac crest,
- spinous processes of the lumbar and
- last 2 thoracic vertebrae
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Insertion of erector spinae group
- various attachments at the posterior ribs
- spinous and
- transverse processes of thoracic and
- cervical vertebrae and
- mastoid process of temporal bone
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action of erector spinae group
- unilaterally:
- laterally flex vertebral column to the same side
- bilaterally:
- extend the vertebral column
-
nerve of the erector spinae group
spinal
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origin of spinalis
- spinous processes of the upper lumbar and lower thoracic vertebrae (thoracis)
- Ligamentum nuchae,
- spinous process of C7 (cervicis)
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Origin of Longissimus
- common tendon (thoracis)
- tvp of upper 5 thoracic vertebrae (cervicis and capitis)
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Insertion of Longissimus
- lower 9 ribs and
- tvp of thoracic vertebrae (thoracis)
- tvp of cervical vertebrae (cervicis)
- mastoid process of temporal bone (capitis)
-
origin of iliocostalis
- common tendon (lumborum)
- posterior surface of ribs 1-12 (thoracis and cervicis)
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Insertion of iliocostalis
- tvp of lumbar vertebrae 1-3 and
- posterior surface of ribs 6-12 (lumborum)
- posterior surface of ribs 1-6 (thoracis)
- tvp of lower cervicals (cervicis)
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