FERTILIZATION VS IMPORTANT EVENTS

FERTILIZATION VS IMPORTANT EVENTS

"O' hour →Fertilization (day-15 from LMP)

30 hours → 2-cell stage (blastomeres)

40-50 hours →4-cell stage

72 hours→ 12-cell stage

96 hours → 16-cell stage. Morula enters the uterine cavity

5th day→Blastocyst

4-5th days→ Zona pellucida disappears

5-6th days →Blastocyst attachment to endometrial surface

6-7th days →Differentiation of cyto and syncytiotrophoblastic

9th day →lacunar period, endometrial vessels tapped

10th day→ Synthesis of hCG by syncytiotrophoblast

10-11th day→ Implantation completed

13th day →primary villi seen

16th day→ secondary villi

21 day →tertiary villi

21-22nd day→fetal heart, fetal placental circulation started

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