Egg transport

 

The egg after fertilization in the ampulla must traverse the oviduct to reach the uterus. In marsupial this takes only one day or less than 24 hours. Transportation in marsupial oviduct is rapid. In true mammals transportation varies. In man it takes about 2 days for the egg to reach the uterus after traversing the whole of the oviduct. The egg spends more time in the ampulla than in the isthmus so that human is a chronic ampullary transport mammal while the rat for example is a chronic isthmic egg transport animal.

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