SIXTY FIGURES
INTRODUCTIOKThe development of the lobules and fissures of the mammalian cerebellum has been the subject of numerous investigations since Kuithan (1895) described some phases in the human embryo and Stroud (1895) compared the developing cerebellum of man with that of the cat. Bradley ('03, '04a, b) made a comprehensive investigation of the fissures and lobules of the cerebellum in embryos of a number of mammals and also studied the pattern in adult cerebella of many species. The investigations of Elliot Smith ('02, '03a, b, c) included a wide range of adult cerebella, supplemented by ernbryonic material. The extensive researches of Bolk ( '06) on the adult cerebellum of many species of mammals, supplemented by human embryonic material, resulted in a terminology which has since been widely used. The fundamental morphological problems involved in the relations of many of the lobules of the cerebellum to each other, however, have not been satisfactorily solved, although Scholten ('46) and Jansen ( '50) have recently made important contributions toward solution of them in their studies of the paraflocculus and of the development of the cerebellum of the whale, respectively. The homologies between many of the features of the avian and the mammalian cerebellum, however, remain obscure. The analysis of the bird cerebellum by the present ' Present address: Institute of Anatomy, University of Minnesota.
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