The relationship between the sixth nerve, Gruber's ligament, the carotid artery and the anterior clinoid
process, is necessary to understand the three dimensional structure of the canal.
Pneumatization of anterior clinoid
process was there in 2 (4%) patients; all unilateral.
3 cm in distal diameter is more suitable for the removal of the anterior and posterior clinoid
processes, opening the back of the internal auditory canal and other deep bone removal operations through the keyhole approach.
The sella turcica in the sphenoid bone consists of a central hypophysial fossa and two pair of clinoid
processes (anterior and posterior).
For example, the signal void caused by a pneumatized anterior clinoid
process may mimic an internal carotid artery aneurysm due to juxtaposition with the supraclinoid internal carotid artery.
The remaining 3 aneurysms included one at the clinoid
segment of the right ICA, one at the bifurcation of the right MCA, and one at the bifurcation of the basilar artery and right superior cerebellar artery.
Pneumatization may extend into the greater and lesser wings of the sphenoid or pterygoid process and the anterior clinoid
process; it can also extend into the occipital bone.
Other variants include aeration of the medial pterygoid process (44%), anterior clinoid
process (13%) and posterior orbital wall (Fig.
The CS anatomical knowledge is crucial also for the aneurysms arising from the ophthalmic segment of the carotid artery because the neck of the aneurysm is often hidden by the anterior clinoid
The intracavernous part of CN III enters the cavernous sinus by piercing the dura lateral to the posterior clinoid
The mass extended from high frontal convexity to the left clinoid
The particular emphasis of the cranial work was on the following locations: where those cranial nerves cross the borders of tentorium cerebelli, as they pass through cavernous sinus, where the particularly vulnerable spot was, the fibro-osseous canal beneath the posterior clinoid
processes, at sutura petrobasilaris, and where those nerves enter the orbit through fissure orbital is superior.