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Deep Back Muscles

Origins, Insertions, Actions and Innervations

MuscleOriginInsertionActionInnervationMuscle Group Name
Rectus Capitus Major, Minor and Oblique Capitis Major, Minor ----- ---- Extend and rotate head Dorsal Ramus of C1, Suboccipital Nerve Suboccipital Muscles
Intertransversarii transverse process transverse process of adjacent vertebrae lateral flexion of spine dorsal rami of mixed spinal nerves Segmental Muscle Group
Interspinales spinous process spinous process of adjacent vertebrae extension of the spine (brings segments together) dorsal rami of mixed spinal nerves Segmental Muscle Group
Multifidus Sacrum, ilium, transverse process of lumbar and thoracic, lumbar and cervical vertebrae spinous process (spanning 2-4 intervertebral spaces before inserting) stabilize vertebral column dorsal rami of mixed spinal nerve Transversospinales Group
Semispinalis Cervicis (Thoracis, Cervicis, Capitis) transverse process spinous process and occipital bone (spanning 4-6 vertebral levels, running upward and medially) extends head and vertebral column and rotates contralaterally(except capitis) dorsal rami of mixed spinal nerve Transversospinales Group
Rotatores transverse process and articular process spinous processes (lamina), spans 1-2 levels rotation to opposite side, extension dorsal rami of mixed spinal nerves Transversospinales Group
Splenius Cervicis T3-6 C1-3 bilaterally extends, unilaterally flexes and rotates neck to ipsilateral side dorsal rami of mixed spinal nerves Spinotransversalis Group
Splenius Capitis C7-T4, ligamentum nuchae mastoid process, superior nuchal line bilaterally extends, unilaterally flexes and rotates to ipsilateral side dorsal rami of mixed spinal nerves Spinotransversalis Group
Spinalis (Capitis-blending with semi-spinalis), cervicis and thoracis) spinous process spinous process and occiput extends vertebral column and head dorsal rami of mixed spinal nerve Erector Spinae Group
Longissimus(capitis, cervicis, thoracis) common tendon, transverse process transverse process, angle of ribs and mastoid process extends and laterally bends vertebral column or head dorsal rami of mixed spinal nerve Erector Spinae Group
Iliocostalis (cervicis, thoracis, lumborum) common tendon, ilium, angle of ribs ribs and transverse processes(in cervical region) extends and laterally bends vertebral column dorsal rami from mixed spinal nerves Erector Spinae Group
Created by: jpowley on 2007-10-07



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