ABSTRACT
The ICA enters the posterior dural cavernous sinus, arching upwards then forwards, grooving the medial wall of the sinus to exit superiorly just medial to the anterior clinoid process. The intra-cavernous ICA gives off three main branches, the cavernous, the hypophyseal and meningeal branches. The thin-walled secondary and tertiary branches of these vessels lie in the dural walls of the cavernous sinus. Some of these branches anastomose with the branches of the middle meningeal artery.
