lab ex. 62 fertilization & early development...fetal circulation . ductus arteriosus becomes...
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zygote
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morula
Solid ball of cells 3 days after fertilization
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blastocyst
Morula continues cell division and hollows out to form a blastocyst (day 5 – week 2)
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trophoblast
The cells that form the wall of the blastocyst
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inner cell mass
Eventually becomes the developing offspring
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embryo / gastrula
Embryo is termed a gastrula at the end of the second week
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fetus
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placenta
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maternal portion
The area of the uterine wall (decidua basalis) where the chorionic villi attach
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fetal portion
Includes the chorion and chorionic villi that extends into the uterine wall
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Chorion (maroon)
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chorionic villi
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Amnion (white)
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amniotic cavity (space)
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yolk sac
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Allantois (future umbilical cord)
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Fetal circulation
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ductus arteriosus
Becomes ligamentum arteriosum
Connects the pulmonary trunk to the descending portion of the aortic arch
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ductus venosus
Becomes the ligamentum venosum
Connects the umbilical vein directly to the inferior vena cava, bypassing the liver
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foramen ovale
Becomes fossa ovalis
An opening in the atrial septum where blood passes from the right atrium directly to the left atrium and bypassing the lungs
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umbilical cord
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umbilical arteries (blue)
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umbilical vein (red)