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