The morphology of the mammalian cerebellum has remained obscure in some important respects because of insufficient knowledge of the comparative anatomy of the organ. Advances in the knowledge of the structure and development of the cerebellum in amphibians and reptiles, together with a study of the organ, fetal and adult, in several mammals in which this part of the nervous system is relatively primitive, has thrown new light on important aspects of its morphology which have physiologic bearings. A summary of these comparative studies will be presented here.
The cerebellum of the fishes has been so well reviewed by Herrick1 that there is little to add, save to make reference to the newer contributions of van der Horst.2 These consist of an analysis of the cerebellum of the generalized lung-fish, Ceratodus, and of several Ganoidei and Teleostomi. Without going into details, it may be stated that, in general,
LARSELL O. MORPHOGENESIS AND EVOLUTION OF THE CEREBELLUM. Arch NeurPsych. 1934;31(2):373-395. doi:10.1001/archneurpsyc.1934.02250020161008