origin - manubrium and clavicleinsertion - mastoid processesinnervation - accessory nerveblood supply - sternocleidomastoid branch of superior thyroid and occipital arteriesaction - bilaterally- flex head, raise thorax, unilaterally- turn head towards opposite side

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1.
origin - manubrium and clavicle

insertion - mastoid processes

innervation - accessory nerve

blood supply - sternocleidomastoid branch of superior thyroid and occipital arteries

action - bilaterally- flex head, raise thorax, unilaterally- turn head towards opposite side