 Crathorn goes on to describe the different parts of the brain and their functions. As the canonical medieval topology of the brain suggests, there are three main lobes (cellulae) connected by nerves through which the information conveyed by the species can be transferred from one lobe to another. The first lobe corresponds to sensitive imagination (cellula fantastica), the second to conceptualization and discourse (cellula syllogistica) and the third to memory (cellula memoriale) (I Sent. q. 2, concl. 4).