<prompt> All is true about notochord ExceptDerived from mesoderm between prochordal plate and primitive pitCauses induction of the overlying ectoderm to form nervous systemBecomes annulus fibrosus of adult interveebral discRemnants may persist and give rise to a chordoma  <response>: Becomes annulus fibrosus of adult interveebral discThe notochord is a flexible, rod-shaped body composed of cells derived from the mesoderm and defining the primitive axis of the embryoThe notochord is found on the ventral surface of the neural tube is replaced by the veebral column during developmentPostembryonic vestige of the notochord is found in the nucleus pulposus of the interveebral disks, but not in the veebral bodies, from which notochordal cells usually regress entirely. Remnants may persist and give rise to a chordomaNotogenesis is the development of the notochord by the epiblasts that make up the floor of the amnion cavity The notochord forms during gastrulation and soon after induces the ectoderm to form the neural plate neurulation, synchronizing the development of the neural tube. On the ventral aspect of the neural groove, an axial thickening of the endoderm takes place. This thickening assumes the appearance of a furrow the chordal furrow the margins of which come into contact, and so conve it into a solid rod of polygonal-shaped cells the notochord which is then separated from the endoderm. 