The reproductive system and its ducts

The reproductive system and its ducts - The reproductive...

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The reproductive system and its ducts. The gonads develop in the same dorsolateral region as the kidneys. Gonads are initially equipped with two sets of ducts. Why? Well remember that nephrotomes, ciliated ducts passing to the outside originally carried germ cells. When the connection to the coelom was lost an alternative duct system, the parmesonephric ducts were developed to provide passage for the germ cells. When, in turn the mesonephric duct became redundant it was reclaimed by the reproductive system. As it happens the male reproductive duct develops from the mesonephric duct and the female from the paramesonephric. Reproductive system The whole embryology of the reproductive system is fascinating. The sex of an embryo is determined at conception by its chromosome content. In man 46+XX is female, 46 +XY is male. However the gonads, when they first form are of an indifferent type, that is the same in both sexes. Another point of interest is that the actual germ cells, which are to become eggs and sperm develop in another part of the embryo entirely from the gonads - in fact near the heart. They then migrate through the tissue of the embryo to the gonad. By the time they arrive the gonad has prepared itself by becoming male or female. In the male changes are under the influence of the Y
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The reproductive system and its ducts - The reproductive...

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