Dissection of the Basal Surface of the Brain. Dissection of the basal surface of the brain with Klingler’s technique and preserving the posterior cerebral artery (PCA) and its branches. The brainstem is sectioned at the level of the pontomesencephalic junction. The basal surface of the left temporal lobe is dissected to disclose the inferior longitudinal fasciculus, hippocampus, calcar avis, atrium, temporal, and occipital horns of the lateral ventricles. The arcuate fibers are seen where the gray matter was removed. 1, Basilar artery trunk; 2, P1 segment of PCA; 3, P2A segment; 4, P2P segment; 5, P3 segment; 6, calcarine fissure; 7, amygdala; 8, hippocampus head; 9, temporal horn; 10, ventricular atrium; 11, occipital horn; 12, temporal arteries; 13, A2 segment: 14, A1 segment; 15, M1 segment; 16, internal carotid artery; 17, arcuate fibers. (Image courtesy of E de Oliveira)