This section shows the choroid plexus in the lateral ventricle of the brain. Note that it appears as a much plicated fold covered by cuboidal epithelium (ependymal) and containing many blood vessels. The epithelium is directly concerned in the secretion of the cerebro-spinal fluid, which is discharged into the ventricular cavity. The section is stained with haematoxylin and eosin and the photomicrographs are at a magnification of X 4 and X 210.

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