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对生殖器解剖有了初步认识,需进一步知道女性各期的生理特点 1.胚胎及胎儿期 (1)Y染色沐胚胎6周后开始性分化。Y染色体决定性别分化。如来自男方的精子含有Y染色体,则性腺发育为睾丸,成为男性;如精子含的是X染色体,则性腺将发育成卵巢,胎儿即为女性。 (2)H—Y抗原 Y染色体上有H—Y抗原,它与Y染色体上的特定基因共同作用,使生殖嵴细胞和原始性细胞形成睾丸。如此种特
Anatomy of the genital have a preliminary understanding of the need to know more about the physiological characteristics of women 1 embryonic and fetal (1) Y staining embryos began to differentiate after 6 weeks. Y chromosome determines sex differentiation. If the sperm from the man contains the Y chromosome, the gonads develop into testicles and become male. If the sperm contains X chromosome, the gonads will develop into ovary and the fetus will be female. (2) The H-Y antigen has the H-Y antigen on the Y chromosome, which interacts with a specific gene on the Y chromosome to form testes in the genital crest cells and primitive cells. Such a special