nervous system PMID:23318641 nerve system PMID:25254346 PMID:22549959 UBERON:0001016 PMID:27612384 PMID:23250205 https://orcid.org/0000-0003-2569-1939 | https://orcid.org/0000-0002-7535-4709 PMID:23297191 PMID:23079596 PMID:29357350 PMID:24131630 PMID:24173799 PMID:19247960 PMID:21806978 PMID:18202849 PMID:27501047 PMID:26556349 PMID:25278423 PMID:22427692 PMID:27864883 PMID:16033796 The nervous system is an organ system containing predominantly neuron and glial cells. In bilaterally symmetrical organisms, it is arranged in a network of tree-like structures connected to a central body. The main functions of the nervous system are to regulate and control body functions, and to receive sensory input, process this information, and generate behavior [CUMBO]. PMID:24950970 PMID:24737865 PMID:30399335 PMID:27013241 PMID:23903188 PMID:16311336 PMID:25725068 PMID:27551436 PMID:19048075 PMID:26114597 PMID:29557542 PMID:20967238 PMID:22696458 Planarian_Anatomy ISBN:9780070316607 PMID:20707997 PMID:17251262 PMID:29674431 PMID:20223763 PMID:27163480 PMID:27523733 PMID:26062938 PMID:27068018 PMID:28292427 PMID:19211673 PMID:22445864 PMID:22339734 anatomical system