mesoderm specialization Flashcards
how does neuro-ectoderm form?
as mesoderm specializes, notochord and prechordal plate induce overlying ectoderm to become neuro-ectoderm.
what happens to neural plates?
neural plate undergoes neural folding to form the neural tube of the embryo.
in what direction does neural folding occur?
it occurs from a more central position and extends toward the cranial (anterior) and caudal (posterior) poles.
what leads to normal brain and spinal cord structures?
ventral flexure
what cells form at the edge of the neural fold?
neural crest cells (neural ectoderm) migrate out to form specialized structures throughout the body.
what do neural crest cells lead to?
a number of structures in the body such as glands, part of autonomic nervous system, and even part of the heart.
what are the two types of folding of the human embryo within amniotic sac?
cranial-caudal ventral folding and lateral folding
what does human cranial-caudal folding process result in?
classical fetal position
during lateral folding, what happens to yolk sac?
what doesn’t get absorbed into fold degenerates
