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Muscles of the Spine Splenius - Erector Spinae - Transverso-Spinal Splenius Group Splenius Capitis: from lower LN and SP of C1-T3 to nuchal line and mastoid process - Splenius Cervicis: from SP of T3-T6 to TP of C2-C4 Erector Spinae Group Iliocostalis - Longissimus - Spinalis Iliocostalis Group Iliocostalis lumborum: from ilio-lumbar fascia to lower ribs - Iliocostalis Thoracis: from lower ribs to upper ribs - Iliocostalis Cervicis: from upper ribs to TP of cervical spine Longissimus Group Generally from TP to TP - Thoracis, Cervicis, Capitis portions Spinalis Group From SP to SP - Thoracic: variable but consistent - Cervicis: absent or having few fibers - Capitis: blends with semispinalis capitis Transverso-Spinal Group Generally from TP to SP - contralateral rotators - Semispinalis - Multifidi - Rotators Semispinalis Skips 4-6 levels from O to I - 3 sections: thoracis, cervicis, capitis Multifidi Skips 2-4 levels from O to I Rotators From TP to SP (lamina) - Long rotators skip 1 level - Short rotators attach on adjacent vertebrae Interspinales Segmental muscle between adjacent SP Intertransversarii Segmental muscle between adjacent TP