Word: spermatogonia
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...specialists hold that it's actually male astronauts whose reproductive capabilities are more vulnerable. "As far as the acute effects of radiation," says Dr. Richard Jennings, who practices gynecology and aerospace medicine in Texas and co-authored the study, "men are much more at risk than women since the spermatogonia are very sensitive to radiation." (Watch a video about a female welder for NASA...
...outside, however, IVD sperm are not identical to normal sperm. "We think, for normal structure development, sperm needs the testes environment," says Nayernia. It takes 15 to 16 years in the testes before the primordial germ cells that morph into spermatogonia, or a primitive precursor of the germ cells, are able to mature into sperm cells that can successfully fertilize an egg. (See the top 10 medical breakthroughs...
...Harvard Zoological Club. "A Comparison of Phototaxis in Animals from Different 'Communities,'" by Mr. J. M. D. Olmsted.--"The Spermatogenesis of Ascaris canis from the Spermatogonia to the Inter kinetic Period," by Mr. A. C. Walton. Zoological Laboratory, Room...
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