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Intrinsic back muscles (deep back muscles): act on the vertebral column maintain posture DPR Superficial layer of extrinsic back muscles Erector Spinae: intermediate layer of extrinsic back muscles Spinalis: capitis cervicis thoracis Longissimus: capitis cervicis thoracis Iliocostalis: cervicis thoracis lumborum Deep layer of intrinsic back muscles: Transversospinal muscle group Semispinalis Mulitifidus Rotatores ipsilateral rotators contralateral rotators deep neck muscles that, acting bilaterally, extend the neck: 1 – semispinalis cervicis and iliocostalis 5 – longissimus capitis 2 – splenius cervicis and levator scapulae 6 – semispinalis capitis 3 – splenius capitis 7 - trapezius 4 – multifidus Minor deep layer of intrinsic back muscles: Suboccipital Region: Supoccipital triangle boundaries: superomedial Rectus Capitis Posterior Major superolateral Superior Oblique inferolateral Inferior Oblique suboccipital triangle floor and contents and suboccipital n.