After the coalescence of the neural folds over the anterior end of the primitive streak, the blastopore no longer opens on the surface but into the closed canal of the neural tube, and thus a transitory communication, the neurenteric canal, is established between the neural tube and the primitive digestive tube.
After the union of neural folds at the anterior end of the primitive streak, the blastopore no longer opens on the surface but into the closed canal of the neural tube. As a result, there is an interim connection, referred to as the neurenteric canal, between the neural tube and the primitive digestive tube.