KINESIOL 1A03 Lecture Notes - Lecture 2: Yolk Sac, Zona Pellucida, Primitive Streak
19 Sep 2016
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Figure 1: frontal section of uterus showing days after fertilization. Trophoblast: syncytiotrophoblast through endometrium blastocyst, about 8 beginning to embed endometrium wall. Secrete enzymes that are liquefying the endometrial cells allowing the blastocyst to imbed: cytotrophoblast. The chorion (fetal membrane) will consist of the cytotrophoblast and. Syncytiotrophoblast: begin to secrete hgc hormone only when the cell structure become active. Helps maintain lining of endometrium preventing menstruation. Epiblast: align into flat disk with a cavity inside (amniotic cavity) will eventually evolve to hold the developing embryo. Figure 2: frontal section through uterus showing blastocyst, about 9 fertilization endometrium of days after. Blastocyst structure is fully embedded in endometrium: syncitiotropho and cytrophoblast digested all endometrium cells. Lacunae: open cavities for blood suppy and formation of placenta. Hypoblast cells migrate out into open cavity known as exocoelomic membrane. Figure 3: frontal section through endometrium of uterus showing blastocyst, about 12 days after fertilization.
