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produced from mesoderm; defining the primitive axis of the embryo - in lower vertebrates it persists through life as the main axial support of the body; in higer vertebrates it is replaced with the vertebral column
*found in the ventral surface of the neural tube |
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| segmented blocks; gives rise to vetebrae backbone and muscles associted with the axial skeleton also dermis and connective tissue |
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here a cavity develops in a lateral plate mesoderm called the intraembroytic coelomic cavity; continuous with the extraembryotic coelum; derives fro the somatic mesoderm and splanchnic mesoderm
*gives rise to connective tissue and skeleton of body wall |
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| gives rise to the heart, blood vessels, blood cells, stomia of the gonads, smooth muscle of viscera and cortex of adrenal glands |
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| gives rise to the kidneys, associated ducts, epididymis and van deferns in the male and vagina oviducts and urtherus in the female |
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first extra membrane to develop jut 78 days of developent; contains vielline fluid for the nourishment of the embryo
*produces RBC for embryo until the liver develops during the 5th week |
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involved in the formation of blood cells and blood vessels - the umbilical arteries and veins - in the umbilical cord, which join embryo with placenta
*late becomes the urinary bladder |
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encloses the embryo in a fluid-filld caivity
*keeps embryo from drying out and is a shock absorber |
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outermost membrane; developed from the tropholoblast; completely surrounds the embryo
*protective membranes=forms a portion of the placenta
*secretes hCG to then secrete hormones such as estrogen to maintain the uterine lining |
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