SEMICIRCULAR CANALS
\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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Three long canals (anterior, posterior, and lateral) of the labyrinth. They are set at right angles to each other and are situated superior and posterior to the vestibule.
By DataStellar Co., Ltd
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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 commu’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
Word of the day
Dopamine Acetyltransferase
- An enzyme that catalyzes the of groups from acetyl-CoA to arylamines. They have wide specificity for aromatic amines, particularly serotonin, and can also catalyze acetyl transfer between arylamines without CoA. EC 2.3.1.5.