caudal neuropore

cau·dal neu·ro·pore

the temporary opening at the extreme caudal end of the neural tube in early embryos; closes at approximately the 25th somite stage (that is, at about 27 days) in humans.
Synonym(s): posterior neuropore
Farlex Partner Medical Dictionary © Farlex 2012
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The essential defect is a failure of closure of the caudal neuropore.
When caudal neuropore fails to close, open dysraphism ensues7.