BIO SCI 75 Lecture Notes - Lecture 6: Urogenital Sinus, Paramesonephric Duct, Y Chromosome
8 Jun 2016
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Document Summary
General principles: early male and female embryo are the same. Takes 2 months to see a difference but they become different. Development determined by genetics and presence of the y chromosome. Reproductive organs (internal: bipotential (early undifferentiated) stage. Gonad: start as a ridge along one edge of the kidneys and they keep growing and protruding out and eventually become detached and develop into another organ. Mesonephric (wolffian) ducts: primitive kidney has duct which exits at urogenital sinus (near anus) Mullerian ducts: another pair of ducts forms along side mesonephric ducts and exist at urogenital sinus. Gonad: primordial cells sex cords become seminiferous tubules which connect up to tubules within primitive kidney become epididymis. Gonad: sex cord degenerate, outer part of gonad (cortex) grows. Mullerian duct becomes the oviduct and near urogenital sinus ducts fuse to become the uterus. Genital tubercle at front of elongated urogenital sinus. Genital tubercle (genital bulge) grows to be glans (head) of penis.
