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| the study of the origin and development of the individual person |
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| between conception and birth |
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| early form of the body. by the end, all major organs are in place |
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| in the fetal period the organs grow more complex |
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| fertilization of oocyte by sperm |
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| the cells produced through division after fertilization. |
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| first 12-16 blastomeres at day three...it continues to grow |
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| post morula. the form has developed into more than 60 cells and has dropped into the uterus. it gathers fluid in a central cavity. |
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| inner cell mass vs trophoblast |
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| 2 types of cells in the blastocyst . 1=mas on one side of the cell-becomes embryo 2=surrounds the cavity-becomes placenta |
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| the blastocyst burrows into the wall of the uterus |
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| gives rise to the whole body. made up of the epiblast and the hypoblast |
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| the sac formed by the extension of the epiblast |
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| formed by the extension of the hypoblast - digestive tubes for from part of it. |
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| on the dorsal surface of the epiblast on day 14-15 |
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| epiblast cells migrate inward through the primitive streak |
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| the cells that migrate through the primitive streak and replace the hypoblast day 14-15 |
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| the layer of epiblast cells that go through the primitive streak and layer on top of the endoderm day 16 |
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| the remaining epiblast celss on the dorsal surface after the endoderm and mesoderm have fromed |
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| swelling at one end of the primitive streak |
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| the ectoderm, overlying the notochord, begins forming the spinal cord and brain |
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| thicking portion of the ectoderm in the dorsal midline |
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| the grove formed when the neural plate folds inward |
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| forms out of the deepening of the neural groove |
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