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The Epic Interactive Encyclopedia 1998
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Epic Interactive Encyclopedia, The - 1998 Edition (1998)(Epic Marketing).iso
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P
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Penis
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INFOTEXT
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1992-09-03
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681b
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The penis is the male reproductive organ
containing the urethra, the channel through
which urine and semen are voided. It
transfers sperm to the female reproductive
tract to fertilize the ovum. In mammals, the
penis is made erect by vessels that fill with
blood, and in most mammals (but not humans)
is stiffened by a bone. Snakes and lizards
have a paired structure that serves as a
penis, whilst other reptiles have a single
organ. A few birds, mainly ducks and geese,
also have a type of penis, as do snails,
barnacles, and some other invertebrates.
Many insects have a rigid, nonerectile male
organ, usually referred to as an
intromittent organ.
Subject by: Vince Pike