Topography of occipital lobe commissural connections in the rhesus monkey

The organization of occipital lobe commissural connections is re-examined in the rhesus monkey by the autoradiographic technique. A general topographic order was observed in the splenium. Fibers from area 18 occupy its most caudal and ventral subdivision, while those from different parts of area 19 surround the area 18 zone rostrally and dorsally. Results also indicate, however, divergent trajectories within each compartment, as well as significant overlap at their borders.