The cerebellum is knit in with the neuromotor apparatus of the body in diverse ways in different groups of vertebrates, and a survey of some of its generalized and aberrant forms may point the way to a better understanding of the mammalian type. If we can discover what functional factors were primitively concerned in the initial differentiation of the cerebellum from preexisting bulbar structures and some of the steps by which additional functional systems of diverse kinds were drawn into the cerebellar complex, some light may be shed on the great problems of the analysis of higher cerebellar functions. The accumulated data of comparative anatomy, embryology and physiology furnish the materials for such a survey and for tentative conclusions.
This summary is perforce presented largely in terms of comparative anatomy. The legitimate demand for experimental control of physiologic inferences drawn from known structural arrangements can receive meager satisfaction, for only
HERRICK CJ. ORIGIN AND EVOLUTION OF THE CEREBELLUM. Arch NeurPsych. 1924;11(6):621–652. doi:10.1001/archneurpsyc.1924.02190360009001
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