Science Fair Project Encyclopedia
Oviduct
In oviparous animals (those that lay eggs), the passage from the ovaries to the outside of the body is known as the oviduct. The eggs travel along the oviduct.
The oviduct in birds is divided in several parts:
- Infundibulum (formation of Chalazae, place of fertilization)
- Magnum (formation of egg white)
- Isthmus (formation of the shell membrane)
- Uterus (formation of egg shell)
- Vagina (formation of cuticula)
In mammals, which evolved from reptiles, the oviduct turned into the Fallopian tubes, the uterus and the vagina. The eggs don't travel all the way, but stay in the uterus. In these animals, the term oviduct should not be used.
10-26-2009 08:16:03
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details