I. Ectoderm. 60 X 1.Neural tube3. somite 5. yolk sac 7. aorta 2.Amniotic cavity 4. nephrogenic cord 6. notochord8. embryonic.
Nervous system. ■ is a complex, sophisticated system that regulates and coordinates activities of the body ■ regulates the body's responses to internal.
Basic embryonic body plan
