fig4

Figure 4. Endoscopic endonasal view of the posterior wall of the sphenoid sinus in a cadaveric specimen. A midline septum was partially drilled. In the midline, in a craniocaudal direction, the tuberculum sellae, the sella, and the clival recess are evident. Laterally, the carotid prominence (red lines) and, superiorly, the optic nerve (golden lines) are delimited. The medial and lateral IOC recesses are also marked. ICA: internal carotid artery; IOC: interoptico-carotid