Figure 1:

Intraoperative figure and schematic representation of multiple hippocampal transection. (a) Proximal part of the sylvian fissure is opened. The dotted line indicates the site of the temporal stem dissection parallel to the inferior peri-insular sulcus (arrows). fl: Frontal lobe; li: Limen of insule; lw: Lesser wing of sphenoid bone; m1, m2: Segments of middle cerebral artery; tl: Temporal lobe; tv: Temporal vein. (b) Transection locations along hippocampus; (c) Approach is performed through the Sylvian fissure, after lesionectomy and dissection of the limen insula the temporal horn of the lateral ventricle is opened; (d) Hippocampus (h) is intersected in the orthogonal plane to its longitudinal axis with a blunt silver knife (white circle) up to the hippocampal fissure (hf) with preservation of fimbria (f); following transection of hippocampus the parahippocampal gyrus is transected with a blunt silver knife (hollow circle) in the same plane as the hippocampus up to the tentorium (t) and to the arachnoid membrane of the ambient cistern inferomedially and to the hippocampal fissure (hf) dorsally. h: Hippocampus; ph: Parahippocampus; f: Fimbria; hf: Hippocampal fissure; t: Tentorium.