A RELIABLE SYSTEM OF VENTRICULAR COORDINATES FOR THE CARTOGRAPHY AND STEREOTAXY OF THE AMYGDALA (AND ANTERIOR HIPPOCAMPUS) IN MACAQUES

The most reliable stereotactic methods in primates resort to ventricul ar as opposed to bony landmarks. The usual CA-CP system did not appear satisfactory for stereotaxy of the amygdala and anterior hippocampus. Variation studies on ventriculograms and reconstructions from histolo gical material were done to find more reliable systems. The most preci se system of coordinates for cartography and stereotaxy of the amygdal a is based on the 'amygdalar notch', a ventricular diverticulum formin g the angle between the inferior and anterior borders of the temporal horn of the lateral ventricle, located beneath the inferior border of the amygdala. The AN point, the vertex of the notch in the sagittal di rection, is a reliable ventricular landmark in the antero-posterior an d infero-superior directions. The medial vertex of the diverticulum, A Nm, is a ventricular landmark in the medio-lateral direction. The 'AN system of coordinates' is a reliable system for amygdalar stereotaxy. Stereotaxy of the anterior hippocampus would benefit from other ventri cular landmarks. The most lateral point of the main body (HiL) is a la ndmark for the medio-lateral dimension. Ventriculography and ventricul ar landmarks should always be used for stereotaxy in primate species. (C) 1997 Elsevier Science B.V.