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
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Platidiam
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