part_of part of part of expresses expresses neurecto-epithelial cell neural cell hypendymal cell A neurecto-epithelial cell that is part of the basal layer of the subcommissural organ and specializes in the secretion of proteins into the subarachnoid space. Hypendymal cells have similar characteristics to ependymal cells and express SCO-spondin. SCO-spondin subcommissural organ