Urogenital opening: Difference between revisions
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In [[placental mammals]], these three systems are more separated. In females, separate [[Body orifice|orifice]]s have evolved for all three, while in males, a common [[urinary meatus]] discharges both [[urine]] and [[semen]] from the [[urethra]].<ref name="Hyman1992">{{cite book|author=Libbie Henrietta Hyman|title=Hyman's Comparative Vertebrate Anatomy|url=http://books.google.com/books?id=VKlWjdOkiMwC&pg=PA583|date=15 September 1992|publisher=University of Chicago Press|isbn=978-0-226-87013-7|pages=583–}}</ref> |
In [[placental mammals]], these three systems are more separated. In females, separate [[Body orifice|orifice]]s have evolved for all three, while in males, a common [[urinary meatus]] discharges both [[urine]] and [[semen]] from the [[urethra]].<ref name="Hyman1992">{{cite book|author=Libbie Henrietta Hyman|title=Hyman's Comparative Vertebrate Anatomy|url=http://books.google.com/books?id=VKlWjdOkiMwC&pg=PA583|date=15 September 1992|publisher=University of Chicago Press|isbn=978-0-226-87013-7|pages=583–}}</ref> |
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==References== |
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Revision as of 06:19, 15 February 2016
 | This article needs additional citations for verification. (December 2009) |
The urogenital opening is where bodily waste and reproductive fluids are expelled to the environment outside of the body cavity. In some organisms, including birds and many fish, discharge from the urological, digestive, and reproductive systems empty into a common sac called the cloaca.
In placental mammals, these three systems are more separated. In females, separate orifices have evolved for all three, while in males, a common urinary meatus discharges both urine and semen from the urethra.[1]
References
- ^ Libbie Henrietta Hyman (15 September 1992). Hyman's Comparative Vertebrate Anatomy. University of Chicago Press. pp. 583–. ISBN 978-0-226-87013-7.
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