http://pharyngula.org/index/weblog/comments/penis_evolution/P25/
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606174 Links
http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?cmd=entry&id=606174BACULUM,
CONGENITAL ABSENCE OF
Alternative titles; symbols
OS PENIS, CONGENITAL ABSENCE OF
....
Gilbert and Zevit (2001) pointed out that another genetic condition, affecting 100% of human males, is congenital lack of a baculum (os priapi; os penis).
Whereas most mammals (including common species such as dogs and mice)
and most other primates (except spider monkeys) have a penile bone, human males lack this bone and must rely on fluid hydraulics to maintain erections.
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