part_of part of part of contained in existence overlaps material entity anterior region of the whole animal dorsal region of the whole animal posterior compartment of the whole animal juvenile head prepharyngeal region parapharyngeal region tail neuropil neuron associated cell (sensu Nematoda and Protostomia) adult hermaphrodite asexual adult copulatory region glial cell PMID:29674431 PMID:29674432 glia PMID:27612384 PMID:27612382 PMID:28137894 glia cell PMID:30471994 CL:0000125 Planarian_Anatomy https://orcid.org/0000-0003-2569-1939 | https://orcid.org/0000-0002-7535-4626 A non-neuronal cell of the nervous system. They not only provide physical support, but also respond to injury, regulate the ionic and chemical composition of the extracellular milieu, guide neuronal migration during development, and exchange metabolites with neurons.