SINUSES OP THE DURA MATER
\sˈa͡ɪnəsɪz ˈɒp ðə djˈʊ͡əɹə mˈe͡ɪtə], \sˈaɪnəsɪz ˈɒp ðə djˈʊəɹə mˈeɪtə], \s_ˈaɪ_n_ə_s_ɪ_z ˈɒ_p ð_ə d_j_ˈʊə_ɹ_ə m_ˈeɪ_t_ə]\
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are formed by a separation of the layers of the dura mater, which acts as a substitute for the outer membrane of veins. Bichat admits only four great sinuses, of which all the others seem to be dependencies; - the two lateral sinuses, the straight sinus, and the longitudinal sinus. To the lateral sinuses belong, - the petrous sinuses, superior and inferior; the transverse sinus; the cavernous sinuses; the coronary sinus, and the occipital sinuses. To the straight sinus belongs the inferior longitudinal. The longitudinal sinus, properly so called, has no sinus under its dependence.
By Robley Dunglison
Word of the day
basidiomycota
- comprises fungi bearing the spores on basidium: Gasteromycetes (puffballs); Tiliomycetes (comprising orders Ustilaginales (smuts) and Uredinales (rusts)); Hymenomycetes (mushrooms; toadstools; agarics; bracket fungi); in some classification systems considered a division of kingdom comprises fungi bearing spores on a basidium; includes Gasteromycetes (puffballs) Tiliomycetes comprising the orders Ustilaginales (smuts) and Uredinales (rusts) Hymenomycetes (mushrooms, toadstools, agarics bracket fungi).