Axial Perspective of Left Insular Region. E, Superior view of the left hemisphere. An axial cut has been made to expose the lateral ventricle. The frontal and parietal opercula have been removed to expose the insula and the temporal opercula. 1, rostrum of the corpus callosum; 2, head of the caudate nucleus; 3, planum polare; 4, insula; 5, thalamus; 6, Heschl’s gyrus; 7, choroid plexus of the atrium of the lateral ventricle covering the pulvinar of the thalamus; 8, middle transverse temporal gyrus; 9, posterior transverse temporal gyrus. The arrow indicates the medial end of the Heschl’s gyrus that points toward the posterior limb of the internal capsule and toward the atrium of the lateral ventricle. The arrowheads indicate the location of the angiographic sylvian point. (Images courtesy of AL Rhoton, Jr.)