https://doi.org/10.1351/goldbook.10521
Infoldings of blood vessels of the pia mater, projecting into the cerebral ventricles, covered with ependymal cells, and secreting cerebrospinal fluid.
Infoldings of blood vessels of the pia mater, projecting into the cerebral ventricles, covered with ependymal cells, and secreting cerebrospinal fluid.