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| Mastoid emissary vein ： ウィキペディア英語版 |
Emissary veins
The emissary veins connect the extracranial venous system with the intracranial venous sinuses. They connect the veins outside the cranium to the venous sinuses inside the cranium. They drain from the scalp, through the skull, into the larger meningeal veins and dural venous sinuses. They are common in children.
Emissary veins have an important role in selective cooling of the head. They also serve as routes where infections are carried into the cranial cavity from the extracranial veins to the intrecranial veins.
There are several types of emissary veins including posterior condyloid, mastoid, occipital, and parietal emissary vein.
==Structure==
There are also emissary veins passing through the foramen ovale, jugular foramen, foramen lacerum and hypoglossal canal.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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