\sˌɛmɪsˈɜːkjʊlə kənˈalz], \sˌɛmɪsˈɜːkjʊlə kənˈalz], \s_ˌɛ_m_ɪ_s_ˈɜː_k_j_ʊ_l_ə k_ə_n_ˈa_l_z]\
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By DataStellar Co., Ltd
are seated in the pars petrosa of the temporal bone, and open into the vestibule, behind which they are situate. They are three in number, of which one is superior or vertical, cana'lis semicircula'ris vertica'lis supe'rior; another posterior or oblique, cana'lis semicircula'ris vertica'lis poste'rior, and the third exterior or horizontal, canalis semicircula'ris horizanta'lis. Their parietes are formed of a bony, compact, hard plate. Their uses in audition are not known: at their termination they have the elliptical arrangements called ampul'lae; and by both extremities they open into the vestibule, in the sac at its superior part-the Sac'culus Ellip'ticus, Al'veus seu Utric'ulus seu Sinus commuâ€™nis, Sinus seu Alveus utricula'sus, Sacculus vestibuli or Median sinus, Utricle. In front of the S. ellipticus, nearer the cochlea, and opposite the foramen ovale, is the Sac'culus sphaer'icus, or Sacculus.
By Robley Dunglison
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- One in which inflammatory changes have occurred.