Action: Extends and laterally bends the trunk, neck and headOrigin - Iliac crest, sacrum, transverse and spinous processes of vertebrae and supraspinal ligamentInsertion - Angles of the ribs, transverse and spinous processes of vertebrae, posterior aspect of the skullInnervation - Segmentally innervated by dorsal primary rami of spinal nerves C1-S5

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1.
Action: Extends and laterally bends the trunk, neck and head
Origin - Iliac crest, sacrum, transverse and spinous processes of vertebrae and supraspinal ligament
Insertion - Angles of the ribs, transverse and spinous processes of vertebrae, posterior aspect of the skull
Innervation - Segmentally innervated by dorsal primary rami of spinal nerves C1-S5