海綿竇cavernous sinus)是臨床上最重要的硬腦膜下腔。它位於頭部的蝶骨兩側,因為它內部含有大量的纖維小梁,並在這些纖維小梁間形成空腔從而狀如海棉而得名。一些神經和血管經由海綿竇穿出顱部,海綿竇也對其起到了保護與支持作用。

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