Is There a Neural Tube Defect?

The brain is a projection out from this tube. It closes about da 21 a k. And then what happens? You said, it starts to its like, t ends like a zipper. So just like when you zip in your jacket clothes, it zips both cordally,. down towrds the bottom end, and then cranely up towards the head end. But essentially where it closes at the cranel end, the top end ar that's highly that closes about day 25. Sothits about four days after the first part of the tube closes the arm. That is very dependent on temperature.