In an influential 1947 review, Alf Brodal pointed out that mammal species thought to have no sense of smell nevertheless have fully intact hippocampal formations, that removal of the hippocampal formation did not affect the ability of dogs to perform tasks dependent on olfaction, and that no fibers were actually known that carry information directly from the olfactory bulb to any part of the hippocampal formation.[1] Though massive direct input from the olfactory bulb to the entorhinal cortex has subsequently been found,[2] the current view is that the hippocampal formation is not an integral part of the olfactory system.[3]