Molecular layer

The molecular layer consists of fibers and cells. The nerve fibers are delicate fibrillæ, and are derived from the following sources: the dendrites and axon collaterals of Purkinje’s cells; fibers from cells in the nuclear layer; fibers from the central white substance of the cerebellum; fibers derived from cells in the molecular layer itself. In addition to these are other fibers, which have a vertical direction, and are the processes of large neuroglia cells, situated in the nuclear layer. They pass outward to the periphery of the gray matter, where they expand into little conical enlargements which form a sort of limiting membrane beneath the pia mater, analogous to the membrana limitans interna in the retina, formed by the sustentacular fibers of Müller.