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| mastoid foramen ： ウィキペディア英語版 |
mastoid foramen
The mastoid foramen is a large hole in the posterior border of the temporal bone. It transmits a Mastoid emissary vein to the sigmoid sinus and a small branch of the occipital artery, the posterior meningeal artery to the dura mater.
==Variations==
The position and size of this foramen are very variable; it is not always present; sometimes it is situated in the occipital bone, or in the suture between the temporal and the occipital.
It transmits (1) an emissary vein connecting the sigmoid sinus with the posterior auricular vein and (2) a meningeal branch of the occipital artery
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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