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Sternocleido mastoideus
/stˌɜːnəklˈeɪdəʊ mastˈɔɪdɪəs/
/stˌɜːnəklˈeɪdoʊ mæstˈɔɪdɪəs/Sternocleido mastoideus
01
one of two thick muscles running from the sternum and clavicle to the mastoid and occipital bone; turns head obliquely to the opposite side; when acting together they flex the neck and extend the head
