The cerebellum of cartilaginous and bony fishes is extraordinarily large and complex. In at least one important respect, it differs in internal structure from the mammalian cerebellum: The fish cerebellum does not contain discrete deep cerebellar nuclei. Instead, the primary targets of Purkinje cells are a distinct type of cell distributed across the cerebellar cortex, a type not seen in mammals. In mormyrid fish (a family of weakly electrosensitive freshwater fish), the cerebellum is considerably larger than the rest of the brain. The largest part of it is a special structure called the valvula, which has an unusually regular architecture and receives much of its input from the electrosensory system.
The cerebellum of cartilaginous and bony fishes is extraordinarily large and complex In at least one important respect it differs in internal structure from the mammalian cerebellum The fish cerebellum does not contain discrete deep cerebellar nuclei Instead the primary targets of Purkinje cells are a distinct type of cell distributed across the cerebellar cortex a type not seen in mammals In mormyrid fish (a family of weakly electrosensitive freshwater fish) the cerebellum is considerably larger than the rest of the brain The largest part of it is a special structure called the valvula which has an unusually regular architecture and receives much of its input from the electrosensory system