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14 Cards in this Set
- Front
- Back
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bilaminar
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having two layers; used to refer to mammalian embryo when inner cell mass separates into upper epiblast and lower hypoblast
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blastocyst
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the developmental stage following the morula; as this stage matures, the zona pellucida is lost, allowing the conceptus to adplant and implant into uterine wall
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blastomeres
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the cells resulting from the initial rounds of mitotic division; these become smaller with each division
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corona radiata
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layer of follicule cells of cumulus oophorus remaining to zona pellucida of the oocyte after ovulation
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inner cell mass
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the clump of cells found inside the blastocyst; These cells will go into form the embryo, these are "stem cells" that are totipotent; they can form any tissue in embryo
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morula
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early stage of development (12-15 cells); followed by formation of a cavity in the mass (blastocyst stage)
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parental genomes
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the male (sperm) and female (oocyte) DNA which contribute to the embryo's cells
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polar bodies
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3 exclusion bodies which contain the DNA not used by the embryo; contributed to originally by the meiotic division of the oocyte
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pronuclei
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the male (sperm) and female (oocyte) nulcei within the fertilized oocyte, prior to their combination to form the new embryo's nuclei
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trilaminar embryonic disc
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3 layered embryo stage
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trophoblast
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outer layer of cells on blastocyst that will generate embryonic part of placenta
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uterine wall
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the site of normal blastocyst implantation
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zona pellucida
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glycoprotein shell that surrounds the oocyte through to blastula stage of development
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zygote
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the first cell stage following fertilization of the oocyte by the sperm; this is the first cell of the conceptus that will divide into blastomeres
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