part of part of luminal space of anatomical space neural tube neural tube lumen (...) 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:0011073 An anatomical space that surrounded_by a neural tube. EHDAA2:0001269 EHDAA:2889 EHDAA:914 EMAPA:16167 EMAPA:16533 UBERON:0003842 UBERON:0005713 VHOG:0001119 XAO:0000252 cavity of neural tube central lumen lumen of neural tube neural lumen neural tube neural lumen neurocoel prosencoel uberon