endoderm
Ectoderm
Nervous tissue is derived from the ectoderm germ layer during embryonic development.
The primary germ layer that forms the brain and spinal cord is called the ectoderm.
The three primary germ layers in the gastrula are the ectoderm (outer layer), mesoderm (middle layer), and endoderm (inner layer). Each layer gives rise to different tissues and organs in the developing embryo.
pseudocoelom
Gastrulation is first step towards germ layer development .
Pale-pink
Melanocytes are derived from the neural crest, which is a transient embryonic structure that forms from the ectoderm germ layer.
endoderm
Ectoderm
Nervous tissue is derived from the ectoderm germ layer during embryonic development.
The primary germ layer that forms the brain and spinal cord is called the ectoderm.
If your question is 'Is the trophoblast present during germ layer formation (i.e. gastrulation) ?' then the answer is YES
The three primary germ layers in the gastrula are the ectoderm (outer layer), mesoderm (middle layer), and endoderm (inner layer). Each layer gives rise to different tissues and organs in the developing embryo.
The middle germ layer is called mesoderm. It gives rise to structures like muscles, bones, and the circulatory system in the developing embryo.
Mesoderm forms muscles .
The endoderm is the germ layer that will become the inner lying of the body cavity as well as on the surface of the organs. Meaning of endoderm is: Endo- = within, plus derm = germ or from.