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10 Cards in this Set
- Front
- Back
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What is the zona pellucida?
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fertilization membrane that hardens once a sperm has entered the egg. prevents polyspermy
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What is a zygote?
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Sperm's DNA mixes with the egg's DNA to form a zygote
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Morula
Blastocyst Blastomere |
a ball-like cluster of cells
a hollow ball of hundreds of cells Each individ. cell of a morula or blastocyst |
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Blastocoel
inner cell mass trophoblast |
hollow center
cell cluster single layer of flat cells around the outside of the blastocyst |
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Implantation
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Blastocyst rests on the endometrium of the uterus and embeds itself in the spongy vascular tissue
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What is Ectoderm and what organs develop from it?
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Outer germ layer = will form structures of the nervous system and the epidermis of the skin
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What is Mesoderm and what organs develop from it?
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Third and last of the primary germ layers to appear; forms muscles, bones, blood, and other remaining body parts
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What is Endoderm and what organs develop from it?
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Inner germ layer; will form epithelial linings of the digestive, respiratory and urogenital systems, associated glands, liver, and yolk sac.
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Gastrulation
Gastrula |
Process of differentiation of the inner cell mass.
During second week, developing embryo referred to as gastrula |
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Amnion
Yolk sac Allantois Chorion |
Encloses embryo - protects embryo and maintains homeostasis
produces earliest blood cells and vessels aids in transfer of material between mother and fetus outermost membrane -will help form placenta. |
