Petrosquamous sinus
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.This article incorporates text in the public domain from page 658 of the 20th edition of Gray's Anatomy (1918)This cardiovascular system article is a stub.You can help Wikipedia by expanding it.