The development of the rhinencephalon varies among species. The piriform cortex is part of the rhinencephalon situated in the cerebrum. Periamygdaloid cortex (or periamygdalar area) is a portion of the rhinencephalon consisting of paleocortex. Prepyriform area (or prepiriform cortex) is a portion of the rhinencephalon consisting of paleocortex. The term "rhinencephalon" has been used to describe different structures at different points in time.