part of part of in_anterior_side_of contributes to morphology of existence ends during immediate transformation of gross anatomical part organ fully formed stage multicellular organism brain (...) at some stage of its development, every chordate exhibits five uniquely derived characters or synapomorphies of the group: (...) (4) a single, tubular nerve cord that is located dorsal to the notochord (...) (reference 1); The neural tube is destined to differentiate into the brain and spinal cord (the central nervous system) (reference 2).[well established][VHOG] AAO:0010478 ABA:Brain BAMS:Br BAMS:Brain BILA:0000135 BTO:0000142 CALOHA:TS-0095 Cavitated compound organ which is comprised of gray and white matter and surrounds the cerebral ventricular system.[TAO] DHBA:10155 EFO:0000302 EHDAA2:0000183 EHDAA:2641 EHDAA:6485 EMAPA:16894 EV:0100164 FBbt:00005095 FMA:50801 GAID:571 HBA:4005 MA:0000168 MAT:0000098 MESH:D001921 MIAA:0000098 OpenCyc:Mx4rvVjT65wpEbGdrcN5Y29ycA PBA:3999 Part of the central nervous system situated within the cranium and composed of both nerve cell bodies and nerve fibers.[AAO] TAO:0000008 The brain is the center of the nervous system in all vertebrate, and most invertebrate, animals. Some primitive animals such as jellyfish and starfish have a decentralized nervous system without a brain, while sponges lack any nervous system at all. In vertebrates, the brain is located in the head, protected by the skull and close to the primary sensory apparatus of vision, hearing, balance, taste, and smell[WP]. The part of the central nervous system contained within the cranium, comprising the forebrain, midbrain, hindbrain, and metencephalon. It is derived from the anterior part of the embryonic neural tube (or the encephalon). Does not include retina. (CUMBO) UBERON:0000955 UMLS:C0006104 UMLS:C1269537 VHOG:0000157 XAO:0000010 ZFA:0000008 encephalon galen:Brain http://braininfo.rprc.washington.edu/centraldirectory.aspx?ID=21 requires review for applicability to invertebrate structures, e.g. synganglion suprasegmental levels of nervous system suprasegmental structures synganglion the brain uberon nervous system central nervous system ectoderm-derived structure future brain