The intercavernous sinuses are two in number, an anterior and a posterior, and connect the two cavernous sinuses across the middle line.


The anterior passes in front of the [[hypophysis]] cerebri, the posterior behind it, and they form with the [[cavernous sinus]]es a venous circle (circular sinus) around the hypophysis.

The anterior one is usually the larger of the two, and one or other is occasionally absent.