The term area PEm of Bonin refers to a subdivision of the parietal lobe of the macaque defined on the basis of cytoarchitecture. It is thicker than area PC of Bonin and "is well laminated with a thick internal granular layer. There is a striking clear zone in v, and this layer contains some very large pyramidal cells, almost as large as the largest Betz cells." A number of other authors who have reported these cells are cited ( Bonin-1947 ).