Physiology 1020 Lecture Notes - Lecture 14: Corpus Luteum, Clitoris, Oogenesis
7 Oct 2016
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Purpose: pass on genes of individuals, maintain species. 23 pairs of chromosomes: one pair of sex chromosome. Smaller y: all eggs have x, sperm can carry x or y. Sex of baby predetermined at fertilization: xx female, xy male. Both dependent on what sperm is carrying x or y: development of respective reproductive tract does not begin immediate after fertilization. Reproductive organs develop at 6-7 weeks of gestation: before than, gonads are indifferent (common) Male embryo (6-7 weeks: y chromosome causes indifferent gonads to develop into testes. Female embryo (9 weeks: lack of y chromosomes activates xx female. Once testes and ovaries are developed then external genitalia follow. Male fetus at 7 weeks: testicular cells begin to produce mullerian inhibiting hormone (mih) Causes the mullerian duct to regress: at 9 weeks. Small dose stimulates wolffian duct to develop: into epididymis, vas deferens, seminal vesicles and urethra, also the development of male external genitalia.
