part of part of develops_from embryo neural tube pre-chordal neural plate anterior neural tube (...) 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 (...).[well established][VHOG] AAO:0011012 TAO:0007038 TODO - add grouping class for the anterior end of the neural tube at all stages UBERON:0003080 VHOG:0001384 XAO:0000307 ZFA:0007038 uberon developing anatomical structure