Anatomical considerations for the stereotaxic longitudinal hippocampectomy.

An anatomical study of a new stereotaxic approach to the gyrus hippocampi was done because of the disadvantages of the usual approach, which limited the extent of the Iesion and the destruction technique in its structures. The approach from the occipital burr-hole allows one to introduce the electrode an average of 23° to the basic CA-CP line and 30° to the midline into the longitudinal axis of the gyrus hippocampi. Through the destruction, which starts from the main target point 5 mm behind the tip of the temporal horn and 22–24 mm lateral and which continues 40 mm back, the whole temporal segment of the archicortical structures is removed. It is possible to name the new approach longitudinal stereotaxic hippocampectomy.