Petrosquamous sinus

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Vein: Petrosquamous sinus
Latin Sinus petrosquamosus
Gray's p.658

The petrosquamous sinus, is a fetal vein that generally disappears by birth [1] and, when present, runs backward along the junction of the squama and petrous portion of the temporal, and opens into the transverse sinus.

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This article incorporates text from a public domain edition of Gray's Anatomy.