part_of
part of
part of
embryonic epithelial tube formation
neural tube formation
secondary neural tube formation
neural rod formation
GO:0014026
GO:0014027
medullary rod cavitation
medullary cord biosynthesis
secondary neural tube rod cavitation
biological_process
secondary neurulation
medullary cord formation
The formation of the neural tube by coalescence of mesenchymal cells followed by their conversion to epithelial cells to form a solid cord that subsequently hollows out (cavitates) to create a hollow tube. Secondary neurulation is the typical mechanism of formation of the neural tube posterior to the posterior neuropore in mammals.
GO:0014021