Pernicious
11-08-2014, 06:15 PM
http://a57.foxnews.com/global.fncstatic.com/static/managed/img/fn2/feeds/Newser/876/493/Scientistsfigureouthowourpenisesevolved.jpg?ve=1&tl=1
Most guys probably don't sit around the locker room pondering the finer points of how the male penis evolved, so leave this one to Harvard researchers: The mystery is solved thanks to … lizard limbs.
Yup, Harvard scientists investigating the origin of external genitalia have found a link relating to the development of limbs in a variety of animals. Scientists initially hoped to discover why snakes didn't grow limbs, the Boston Globe reports.
But they instead found that embryonic cells—which produce hind limbs in lizards, limb buds in snakes, and "tail-bud" tissue in mammals—form genitalia with a signal from something called a cloaca.
As Discovery reports, cloaca is "tissue that eventually develops into the urinary and gut tracts." When they transplanted a cloaca onto hind limb cells in a chicken embryo, eureka—genital-like buds formed.
http://www.foxnews.com/science/2014/11/06/scientists-figure-out-how-our-penises-evolved/http://www.debatepolicy.com/attachment.php?attachmentid=6820&stc=1
Most guys probably don't sit around the locker room pondering the finer points of how the male penis evolved, so leave this one to Harvard researchers: The mystery is solved thanks to … lizard limbs.
Yup, Harvard scientists investigating the origin of external genitalia have found a link relating to the development of limbs in a variety of animals. Scientists initially hoped to discover why snakes didn't grow limbs, the Boston Globe reports.
But they instead found that embryonic cells—which produce hind limbs in lizards, limb buds in snakes, and "tail-bud" tissue in mammals—form genitalia with a signal from something called a cloaca.
As Discovery reports, cloaca is "tissue that eventually develops into the urinary and gut tracts." When they transplanted a cloaca onto hind limb cells in a chicken embryo, eureka—genital-like buds formed.
http://www.foxnews.com/science/2014/11/06/scientists-figure-out-how-our-penises-evolved/http://www.debatepolicy.com/attachment.php?attachmentid=6820&stc=1