STERNO-CLEIDO-MASTOIDEUS
\stˈɜːnə͡ʊklˈe͡ɪdə͡ʊmastˈɔ͡ɪdɪəs], \stˈɜːnəʊklˈeɪdəʊmastˈɔɪdɪəs], \s_t_ˈɜː_n_əʊ_k_l_ˈeɪ_d_əʊ_m_a_s_t_ˈɔɪ_d_ɪ__ə_s]\
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A muscle situate at the anterior and lateral part of the neck. It is long and flattened: simple, above; and divided into two portions below; where it is inserted into the anterior and superior part of the sternum, and the inner quarter of the clavicle. Above, it terminates at the mastoid process, which it embraces, at the neighbouring part of the temporal bone, and at the outer third of the upper curved line of the occipital bone. It carries the head forward; inclines, and rotates it to one side. When both contract, they bend the head directly forwards.
By Robley Dunglison
