THE PONS AND THE CEREBELLUM. 



137 



continued on to the termination of the posterior columns of the 

 spinal cord. 



The lateral portions of this roof are composed of a thickish 

 (principally glia) tissue; in the middle line it is nothing hut a 

 thin layer of cuboidal epithelium. Numerous hlood- vessels from 



FIG. 82. 



Section through the cortical layer of the cerebellum. H;ematoxylin staining. 

 Diagrammatic below and to the right. 



Kornerachicht, Granular laver. Jlnrklei/tte, Medullary layer. Pui-l.-injt-'.iclte ZMe, Cells of Purkinje. 

 Riitde, Cortex. Schema, Diagrammatic. 



the pia are distributed through it, and crowd it partly down into 

 the ventricle (plexus choroidcus ventriculi quarti medialis). 

 Opposite the medulla oblongata, its lateral portion forms a sort 

 of sac, which is filled with vascular loops and is called the 

 plexus choroideus lateralis (see Fig. 120). In the middle choroid 



