fig2

Figure 2. Endoscopic endonasal view of the right CS in a cadaveric specimen. The bone covering the CS was completely drilled to expose the ICA, the oculomotor nerves (III, IV, and VI) going to the SOF, and the first branch of the trigeminal nerve (V1). Superiorly, the ON is still covered by a thin layer of bone. The lateral optico-carotid recess is colored in yellow. Medially, the pituitary gland is also exposed. CS: cavernous sinus; ICA: internal carotid artery; ON: optic nerve; SOF: superior orbital fissure