is it the process that resulrs in the formation of three cell layers?

its the taint on your face

A gastrula is an embryo in the cell organization of development, when the three germ layers form. This is called gastrulation, and the three layers are the endoderm, mesoderm, and ectoderm.

A neurula is an embryo at the stage of development when the nervous system begins developing, called neurulation. Neurulation happens after gastrulation.

Ian Rogers has written:

'First dictionary of microcomputing' -- subject(s): Dictionaries, Microcomputers

'Teratogenic and molecular methods for the study of mouse gastrulation and neurulation'

Its is cephalocaudal. It starts from the brain down to the extremities.