Functional Architectonics without Numbers

Abstract

In previous chapters we have described all of the neuronal types in the cerebellar cortex and one of the principal fiber pathways coming into it, the mossy fibers. We therefore have in hand the components of several important circuits through which the mossy fibers can exert an influence on the Purkinje cells, which provide the only outflow from this cortex. We shall not attempt to review the physiological evidence that has been adduced concerning the activity of these circuits. Neither shall we attempt to construct any comprehensive theories of how the cerebellar cortex operates. Our purpose is much more modest. We mean only to discuss some of the functional implications of the morphology. Fig.202 presents a diagram of the interneuronal connections that have been confirmed by electron microscopy of the mammalian cerebellar cortex. As the climbing fiber will be deferred for a later chapter (Fig. 230), only the mossy fiber input is included in this epitome.