jugular fossa n.
An oval depression near the rear border of the petrous portion of the temporal bone in which the beginning of the internal jugular vein lies.
The nearer the jugular fossa is approached the deeper and more difficult becomes the exposure of the vein.
The sinus is first exposed towards the jugular fossa until its surface appears normal for at least half an inch.
The next step is to incise the sinus freely from above downwards towards the jugular fossa and curette out the thrombus.