● preembryonic period(胚前期): before2weks IL embryonic period(胚期):38 weeks 周 4周 周 8周 ● fetal period(胎儿期): after9 Weeks 9周16周 20-3638周
embryonic period（胚期）: 3-8 weeks fetal period（胎儿期）: after 9 weeks preembryonic period（胚前期）: before 2 weeks
Fertilization/(受精) Definition: the process by which the Ampulla site of fertilization (sperm cell penetrates oocyte) male and female gametes(sperm and Uterine tube ovum) unite to give rise to zygote ste: in the ampullary region(壶腹部) of the oviduct Oocyte Ovary Sperm cells deposited in vagina
Fertilization（受精） ▪ Definition: the process by which the male and female gametes (sperm and ovum) unite to give rise to zygote ▪site: in the ampullary region（壶腹部） of the oviduct
精相题O 卵细麗 初级精母 D(0X I 细胞46.XY 初级柳母细慰 D (届6,XⅩ Puting apart of 丹脱○ Anaphase of 1st 精子 细胞 22X23,Y23x123Y 次级卵母@极体 细胞23X V人 极体 ells resulted from 明f 23,X conditions: 1) maturation of oocyte 2)maturation of spermatozoa
conditions: 1) maturation of oocyte 2) maturation of spermatozoa