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day 1
this is the start of the secretory phase. stage 1 - fertilization- the fusion of haploid gametes, egg, and sperm, to form the diploid zygote. -
day 1
secretory phase - stage 1- fertilization - the fusion of haploid gametes, egg, and sperm, to form the diploid zygote. This process includes egg and sperm. Although there can be subtle differences in the fertilization process, they all result in a diploid zygote. The zygote is the first diploid cell that forms after fertilization by fusion of the egg and sperm resulting in the combination of their separate genomes -
day 2
secretory phase - stage 2- morula, blastula -
day 3
Day 3 consists of the blastocyst which forms an outer trophectoderm layer, an inner cell mass, and a blastocoel. The inner cell mass forms the entire embryo and is the source of embryonic stem cells that are capable of forming all cell types within the embryo. The blastocyst stage occurs during the first and second week after fertilization. -
day 4
stage 3 of the secretory phase- blastocyst hatching -
day 5
late secretory, blastocyst -
day 6
secretory phase- stage 4- adplantation -
day 7
Stage 5- During this stage, many things happen. The conceptus completes implantation. The trophoblast cells rapidly multiply. Syncytiotrophoblast cells invade the maternal endometrium. Cytotrophoblast cells form clumps which later form sites of chorionic villi formation. The maternal endometrium begins the decidual process and the endometrial stroma gathers fluid. The extraembryonic cavities begin to form. The bilaminar embryonic disc epiblast and hypoblast form from the ICM. -
day 8
implantation -
day 9
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day 10
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day 11
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day 12
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day 13
stage 6- chronic cavity -
day 14
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day 15
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day 16
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day 17
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day 18
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day 19
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day 20
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day 21
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day 22
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day 23
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day 24
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day 25
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day 26
