Before revision: Structure 250px|Anatomical components of the limbic system The limbic system was originally defined by Paul D. MacLean as a series of cortical structures surrounding the boundary between the cerebral hemispheres and the brainstem.
After revision: Structure 250px|Anatomical components of the limbic system The limbic system was originally defined by Paul Broca as a series of cortical structures surrounding the boundary between the cerebral hemispheres and the brainstem.