Magnified view of upper wall of right cavernous sinus and sellar structures. The left olfactory bulb and tract can be seen emerging from behind the crista galli near the right border of the image and coursing on the floor of the anterior cranial fossa. The oculomotor (CNIII) nerves can be seen entering the lateral wall of the cavernous sinus. They penetrate the dura between the anterior and posterior petroclinoid ligaments lateral to and in front of the posterior clinoid process. The right trochlear (CNIV) nerve has also gained the lateral wall by penetrating the dura between the free and attached edges of the tentorium cerebelli. Ventral to the midbrain is the body of the sphenoid featuring the sella turcica, the midline depression containing the pituitary gland and distal pituitary stalk through the opening of the diaphragma sellae. The sella is bounded anteriorly by the tuberculum sellae and posteriorly by the dorsum sellae and its posterior clinoid processes. In this view, medial to the anterior clinoid processes are the optic nerves (CNII) emerging from the optic canals and the supraclinoid internal carotid arteries. The bone of the planum sphenoidale, anterior to the tuberculum, has been removed to expose the sphenoid sinus.  Dura mater lateral to the body of the sphenoid (lateral wall of cavernous sinus) has been stripped to reveal the cavernous sinus, the cavernous internal carotid artery, and the ophthalmic (CNV1) nerve. (Image courtesy of PA Rubino)