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11 09 07 - Reproductive System I

11 09 07 - Reproductive System I - Chapter 16 The...

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Chapter 16: The Reproductive System Function: to produce gametes, contribute to bringing sperm and egg together, and nourish the egg and/or embryo Major organ- gonad Gonad- 1. Ovary- female 2. Testes (testis)-male Connected to outside through genital ducts Genital Duct 1. Oviduct- female 2. Pronephric duct-male *some variation but mostly the same Gonad develops in neutral state- Indifferent gonad Precursor to differentiation to ovary/testis Neither male or female Development of the “Indifferent Gonad” - forms in the intermediate mesoderm - The gonads (testes or ovaries) develop near the mesonephros in the intermediate mesoderm, forming a pair of genital(or gonadal) ridges that protrude into the coelom -The cells of the ridge differentiate to form the inner medulla of the gonad -medulla-inner part, cell layer - the splanchnic mesoderm lining the coelom (parietal peritoneum) becomes the cortex - cortex= outer part, cell layer The cells that ultimately form the germ cells form from a different location. - “ Primordial germ cells ” originate in the yolk sac (amniotes) or near the yolky cells of the gut in anamniotes. -essentially the same region - These cells migrate through the mesenteries and into the gonad. There, they populate the cortex.
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