part_of part of part of dorsal to ventral to only in taxon only_in_taxon develops from develops from existence starts during produces produces Eumetazoa Chordata sonic hedgehog protein organ embryo stage multi-tissue structure neural tube digestive tract notochord http://upload.wikimedia.org/wikipedia/commons/6/64/Gray19_with_color.png UBERON:0002328 AAO:0000327 uberon GAID:1311 XAO:0000055 VHOG:0000199 FMA:85521 EMAPA:16191 NCIT:C12463 EHDAA:1241 VSAO:0000032 Wikipedia:Notochord BTO:0001768 SCTID:308820002 embryonic notocord CALOHA:TS-0690 UMLS:C0028439 EHDAA:6021 http://evolution.berkeley.edu/evolibrary/images/history/notochords.jpg EHDAA2:0001277 notocord A flexible rod-shaped body found in embryos of all chordates. It is composed of cells derived from the mesoderm and defines the primitive axis of the embryo. In some chordates, it persists throughout life as the main axial support of the body, while in most vertebrates it becomes the nucleus pulposus of the intervertebral disc. The notochord is found ventral to the neural tube. EV:0100002 ZFA:0000135 MESH:D009672 TAO:0000135 MAT:0000281 mesoderm-derived structure ectoderm-derived structure chordamesoderm notochordal plate axial skeletal system