| This sheet thickens and expands and then, in a process called neurulation, folds in on itself to form a hollow tube that pinches off from the surface of the embryo and descends below it. |
| Arsenic-induced exencephaly in the mouse and associated lesions occurring during neurulation. |
| The gastrulation, neurulation and formation of germ layers in Branchiostoma, frog and human beings are then illustrated. |
| After neurulation, paired cavities called Hatschek's diverticula form in the head endoderm. |
| By the 20th day of gestation, the neural tube is formed and begins to close in the early stages of neurulation. |
| Following gastrulation, the Medaka undergoes neurulation and organogenesis. |
