Fig. 12.

Image depicting the paraclival triangles; Inferomedial and inferolateral. The inferomedial triangle is delimited by the posterior clinoid process, the trochlear nerve's dural entrance, and the abducens nerve's dural entrance. The inferolateral triangle is delimited anteriorly; by a line between the entry point of the trochlear nerve (CN IV) to the dural entry point of the abducens nerve (CN VI) at Dorello’s canal. Posteriorly, it’s bordered by a line between the dural entry point CN VI at Dorello’s canal and the superior petrosal vein at the superior petrosal sinus. Its superior border is the line drawn between the entry point of CN IV at the tentorium and the superior petrosal vein at the superior petrosal sinus