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20 Cards in this Set
- Front
- Back
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study of the development of a unicellular zygote into a complete multicellular organism
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embryology
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when more than one egg is fertilized
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fraternal twins
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series rapid mitotic divisions that characterize early embryonic develompent
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cleavage
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solid ball of embryonic cells
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morula
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fluid-filled cavity in the morula
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blastocoel
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hollow sphere of cells in the morula
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blastula
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when the morula develops the blastocoel that later becomes the blastula
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blastulation
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3-layered structure that was transformed from the single-layer blastula
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gastrula
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skin, hair, nails, epithelium of nose/mouth/anus, lens of eye, retina, nervous system
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ectoderm
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epithelial linings of digestive and respiratory tracts, liver, pancreas, thyroid, bladder lining
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endoderm
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musculoskeltal sytem, circulatory system, excretory system, gonads, connective tissue
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mesoderm
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3 primary germ layers in the gastrula form these three
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ectoderm, mesoderm, endoderm
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regions of the germ layers begin to develop into a rudimentary nervous system
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neurulation
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rod of mesodermal cells that develops along the longitudinal axis under the dorsal layer of the ectoderm
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notochord
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body organs begin to form
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organogenesis
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organs increase in size
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growth
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eggs/sperm develop
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gametogenesis
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lines the inside of shells, moist membrane that permits gas exchange
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chorion
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sac-like structure that is involved w/ respiration and excretion and contains numberous blood vessels to transport oxygen, carbon dioxide, water, salt, and wastes
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allantois
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membrane that encloses the amniotic fluid
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amnion
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