High-power view of the pyramidal cell layer of the hippocampus of a rabbit’s brain, stained with methylene blue. The cells have long, coarse apical processes which are directed in parallel formation away from the ventricular surface of the hippocampus. It is the axons of these cells (not visible in the section) which run towards the ventricular surface and collect there to form a layer of fibres, the "alveus". These fibres are collected up into the fimbria and are eventually conveyed by the fornix columns to the mamilliary bodies in the hypothalamus. The photograph is at a magnification of X 500.

Original card