RECEPTACULUM COTUNNII
\ɹɪsɪptˈakjʊləm kˈɒtənˌɪa͡ɪ], \ɹɪsɪptˈakjʊləm kˈɒtənˌɪaɪ], \ɹ_ɪ_s_ɪ_p_t_ˈa_k_j_ʊ_l_ə_m k_ˈɒ_t_ə_n_ˌɪ__aɪ]\
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A triangular space, formed by a separation of the two laminse of the dura mater of the internal ear, near the middle of the posterior surface of the pars petrosa of the temporal bone, where the aquaeductus vestibuli terminates. It is always filled with the Fluid of Cotugno.
By Robley Dunglison