A&P CH20 Pregnancy, Growth, and Development
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| allant- | (sausage-shaped) allantois: tubelike structure extending from the yolk sac into the connecting stalk of the embryo
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| chorio- | (skin) chorion: outermost membrane surrounding the fetus and other fetal membranes
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| cleav- | (to divide) cleavage: period of development characterized by division of the zygote into smaller and smaller cells
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| lacun- | (pool) lacuna: space between the chorionic villi that fills with maternal blood
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| morul- | (mulberry) morula: embryonic structure consisting of a solid ball of about sixteen cells that resembles a mulberry
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| nat- | (to be born) prenatal: period of development before birth
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| troph- | (nurture) trophoblast: cellular layer that surrounds the inner cell mass and helps nourish it
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| umbil- | (naval) umbilical cord: structure attached to the fetal naval (umbilicus) that connects the fetus to the placenta
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