anterior neuropore

ros·tral neu·ro·pore

the temporary opening at the extreme rostral (cephalic) end of the early embryonic forebrain; closes at approximately the 20th somite stage (that is, at about 25 days) in humans.

anterior neuropore

the opening of the embryonic neural tube in the anterior portion of the prosencephalon. It closes on day 25. Compare posterior neuropore. See also horizon.
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