FIG 1. Sagittal cryomicrotomic section through the Meckel cave in the plane of the trigeminal nerves was obtained from the right medial aspect of a cadaveric specimen from a 74-year-old woman. Small portion of the sensory root (SeR) is seen at its entry into the cave. Trigeminal ganglion (thick white arrow) is at the anterior aspect of the cave, and anterior margin of the ganglion adheres to the dural wall (white arrowhead). Multiple sensory rootlets (long black arrows) arise from the concave medial surface of the ganglion (sinus ganglii) (short black arrow) to course in the trigeminal cistern (TC). Superior and inferior lips of the ganglion (thin white arrows) are particularly well displayed. Portion of the maxillary nerve (V2) shown in this plane is surrounded by venous channels (black arrowheads) along the inferior border of the cavernous sinus. Ant = anterior, CA = carotid artery, PC = prepontine cistern, Post = posterior, TE = cerebellar tentorium, TL = temporal lobe.