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Summary
Since the first division cellular until the implantation:
TO the 30 hours of fertilization, the zygote complete its first division Y originates two blastomeres. The following divisions mitotic are asynchronous, for it what a blastomer is higher what the other, being able to have in a moment dice three of they. The Stadium of 4 blastomeres It has place to the 40-50 hours of the fertilization. To the beginning of bedroom day appear Come in 12 Y 16 blastomeres, forming then the morula. This presents a group of cells central or mass cellular internal what give to place to the fabrics of embryo Y a cap surrounding or mass cellular external what I know will convert in the placenta.
When the morula enters in the uterus, begins to enter liquid for the zone pellucid toward the spaces intercellular of the mass cellular internal, converging Y forming the blastocele. The zone pellucid disappears Y the zygote I know call blastocyst. The cells of the mass cellular internal, in is phase call embryoblast, is it so situated in a pole, Y the of the mass cellular external or trophoblast I know flatten Y form the Wall epithelial of blastocyst.
Around of sixth day of developing, the blastocyst I know about, to through of its pole embryonic, to the mucous membrane uterine Y I know start the implantation. The cells trophoblastic on the pole of embryoblast begin to enter Come in the cells epithelial of the mucous membrane uterine for the action of enzymes proteolytic of trophoblast Y for facilitation of endometrium.
11 июл 2024
