E, Enlarged view. The olfactory nerves pass posteriorly above the optic nerves. The choroidal fissure, the cleft between the thalamus and body of the fornix along which the choroid plexus is attached, begins at the posterior edge of the foramen of Monro. The thalamostriate vein courses through the posterior margin of the foramen of Monro and between the thalamus and caudate nucleus. The oculomotor nerves are exposed behind the carotid arteries. F, The cross section has been extended backward to the level of the foramen of Monro. At this level the caudate nucleus is considerably smaller than anteriorly. The globus pallidus has a clearly defined inner and outer segment. The anterior part of the roof of the temporal horn has been removed to expose the amygdala and anterior part of the hippocampus. The amygdala, at its upper margin, blends into the globus pallidus. The combination of the globus pallidus and amygdala seem to wrap around the lateral aspect of the optic tract. The apex of the uncus protrudes medially toward the oculomotor nerve. The anterior uncal segment is located lateral to the carotid artery. The claustrum is located between the insula and the lentiform nucleus. The amygdala fills most of the anterior segment of the uncus and forms the anterior wall of the temporal horn. The amygdala tilts backward above the anterior part of the hippocampal head and roof of the temporal horn. (Images courtesy of AL Rhoton, Jr.)