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. https://cellxgene.cziscience.com/cellguide/CL_4023181 Hypendymal cells are secretory cells located between the ependymal layer and the posterior commissure, forming the hypendmal layer of the subcommissural organ (SCO), a highly conserved gland that is part of the circumventricular system within the brain. Hypendymal cells are bipolar cells with a thin apical pole and basal process. Most of the ultrastructural characteristics of these cells are similar to those described for the ependymal cells (which are arranged into another layer – the ependyma). However, ependymal cells release their secretion into the ventricular cerebrospinal fluid whereas hypendymal cells project processes to the local blood vessels and to the subarachnoidal space. (This extended description was generated by ChatGPT and reviewed by the CellGuide team, who added references, and by the CL editors, who approved it for inclusion in CL. It may contain information that applies only to some subtypes and species, and so should not be considered definitional.) SCO-spondin subcommissural organ