Internal carotid artery C5 segment

The clinoid segment, or C5, is another short segment of the internal carotid that begins after the artery exits the cavernous sinus at the proximal dural ring and extends distally to the distal dural ring, after which the carotid artery is considered 'intra-dural' and has entered the subarachnoid space.

The clinoid segment normally has no named branches, though the ophthalmic artery may arise from the clinoid segment.