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Spinous processes at superior vertebral levels and base of the skullĮxtends and laterally bends trunk and neckĭorsal primary rami of spinal nerves C2-元 Spinous processes at inferior vertebral levels Three parts are named based on their insertions: capitis, cervicis and thoracis Rotates the vertebral column to the opposite sideĬapitis: back of skull between nuchal lines cervicis & thoracis: spinesĮxtends the trunk and laterally bends the trunk, rotates the trunk to theĭorsal primary rami of spinal nerves C1-T12 Long rotatores: spines 2 vertebrae above origin short rotatores: spines Rectus capitis posterior minor is deeper and inserts more medial than rectus The suboccipital triangle is formed by obliquus capitis superior and inferior Occipital bone above inferior nuchal lineĮxtends the head, rotates the head to the same side Greater occipital nerve (DPR of C2) passes superiorly around the inferior
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Semispinalis, multifidus and rotatores make up the transversospinal muscle Spinous processes 2-4 vertebral levels superior to their originĮxtend and laterally bend trunk and neck, rotate to opposite side The intermediate part of the erector spinae it may be subdivided into thoracis, Transverse process at superior vertebral levels and mastoid processĭorsal primary rami of spinal nerves C1-S1 Transverse process at inferior vertebral levels These are small and fairly insignificant muscles The most lateral part of the erector spinae it may be subdivided into lumborum,ĭorsal primary rami of spinal nerves C1-L5 Of these columns has multiple named partsĮxtends and laterally bends the trunk and neckĭorsal primary rami of spinal nerves C4-S5 Laterally, longissimus in an intermediate position and spinalis medially each is separated into 3 columns of muscle: iliocostalis Supplied segmentally by: deep cervical a., posterior intercostal aa., subcostal Segmentally innervated by dorsal primary rami of spinal nerves C1-S5 Iliac crest, sacrum, transverse and spinous processes of vertebrae and supraspinalĪngles of the ribs, transverse and spinous processes of vertebrae, posteriorĮxtends and laterally bends the trunk, neck and head Univ of Michigan - Gross Anatomy - Muscles Tablesīack to menu Muscles of the Back Region - Listed Alphabetically