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organ formed soon after implantation; site of exchange of gases and nutrients between fetus
*fetus receives nutrients from mother blood and disposes of metabolic waste |
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estrogen hormone that prevents the disintegration of the corpus luteum in the ovary and maintain production of hormones at high levels
*hormones responsible for maintaining uterus lining |
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maternal arteries supplies the placenta with blood full of oxygen and nutrients; veins take blood with waste
fetus receives blood with oxygen and nutrients through umbilical veins and dispose through umbilical arteries |
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| begins on day 18 starting with neural place |
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| on both sides of the neural plate |
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| develop the central nervous system, retina,pineal gland, and posterior gland |
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| produces pigment cells of the ski, gives rise to the neurons and glia of the peripheral nervous system and medulla of the adrenal glands |
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| composed entirely of endoderm, present in the embryo during a process of folding |
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| consists of core mesenchyme covered externally by the ectoder and containing an aortic arch artery, a bar of cartilage, a nerve and muscle tissue |
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| produces auditory tubes and the lining of the middle ear cavity |
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| produces the surface of the epithelium and lining of crypts and tonsils |
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| produces superior parathyroid gland |
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| 24-28 days of development; embryotic disc produces a bulge that projects into the amniotic cavity |
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similar movements to that of the head fold
*the embryo is now separated from the rest of the blastodisc and the extraembryotic membrane |
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| extends outside the embryotic body; protects,supplies with nutrients help with respiration and excretion of embryo and later fetus |
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