SUPINATOR RADII BREVIS
\sˈuːpɪnˌe͡ɪtə ɹˈe͡ɪdɪˌa͡ɪ bɹˈɛvɪs], \sˈuːpɪnˌeɪtə ɹˈeɪdɪˌaɪ bɹˈɛvɪs], \s_ˈuː_p_ɪ_n_ˌeɪ_t_ə ɹ_ˈeɪ_d_ɪ__ˌaɪ b_ɹ_ˈɛ_v_ɪ_s]\
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A muscle, seated at the outer and back part of the forearm. It is flattened, triangular, and curved upon itself, in such a manner that it embraces the superior extremity of the radius. It is attached, on the one band, to the external tuberosity of the humerus, and to a small portion of the posterior surface of the ulna, and is inserted into the upper third of the outer and upper surfaces of the radius. It produces, by contracting, the motion of supination.
By Robley Dunglison
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