Action: Flexes head; rotates head laterallyOrigin - Manubrium of sternum; medial clavicle Insertion - Mastoid process of the temporal boneInnervation - Spinal accessory nerve (XI), with sensory supply from C2 & C3 (for proprioception)

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1.
Action: Flexes head; rotates head laterally
Origin - Manubrium of sternum; medial clavicle
Insertion - Mastoid process of the temporal bone
Innervation - Spinal accessory nerve (XI), with sensory supply from C2 & C3 (for proprioception)