Each inferior petrosal sinus drains the cavernous sinus into the internal jugular vein. The inferior petrosal sinus is situated ... Sagittal section of the skull, showing the sinuses of the dura. Dural venous sinuses Inferior petrosal sinus sampling This ... The inferior petrosal sinuses are two small sinuses situated on the inferior border of the petrous part of the temporal bone, ... The inferior petrosal sinus receives the internal auditory veins and also veins from the medulla oblongata, pons, and under ...