What Is Petrosal Sinus?

The superior petrosal sinus is a part of the dural venous sinus system that drains venous blood and cerebrospinal fluid circulating within the cranial cavity. The dural venous sinus system empties into the internal jugular vein and further flows into the cardiovascular circulation via the superior vena cava.

Where is the petrosal sinus?

The inferior petrosal sinuses are two small sinuses situated on the inferior border of the petrous part of the temporal bone, one on each side. Each inferior petrosal sinus drains the cavernous sinus into the internal jugular vein.

Is petrosal sinus sampling painful?

Petrosal sinus sampling is an invasive procedure where blood samples are taken from each side of the veins that drain into the pituitary gland. Although the procedure is not painful, you may experience minor pain when the catheter (tubing) is passed through the veins.