The neural crest primarily stems from the ectoderm which forms the nervous system and receives signals from the mesoderm. Going on, the neural crest allows neural cells to proliferate. The fate of these neural cell cells depends on the environment and other extrinsic factors, such as Bone Morphogenic Proteins (BMPs) and FGF signaling. Usually, blocking BMP and activating FGF signaling induces neural fates. The identities of these neural cells are further specified by the anterior/posterior and dorsal/ventral axis since different cells are formed for different areas of the body.