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M. splenius capitis
the cranial part of the splenius muscle
Origin: Processus spinosi of the 3rd-7th cervical vertebrae and 1st-3rd thoracic vertebrae and ligamentum nuchae
Attachment: Processus mastoideus
Innervation: Rami posteriores C3, C4
Antagonists:
Movement: Lateral flexion if innervated on one side, otherwise reclination