The penis is also provided with veins, arteries and nerves.
The _testiculi_, stones or testicles (so called because they testify one
to be a man), turn the blood, which is brought to them by the spermatic
arteries into seed. They have two sorts of covering, common and proper;
there are two of the common, which enfold both the testes. The outer
common coat, consists of the _cuticula_, or true skin, and is called the
scrotum, and hangs from the abdomen like a purse; the inner is the
_membrana carnosa_. There are also two proper coats--the outer called
_cliotrodes_, or virginales; the inner _albugidia_; in the outer the
cremaster is inserted. The _epididemes_, or _prostatae_ are fixed to the
upper part of the testes, and from them spring the _vasa deferentia_, or
_ejaculatoria_, which deposit the seed into the _vesicule seminales_
when they come near the neck of the bladder. There are two of these
_vesiculae_, each like a bunch of grapes, which emit the seed into the
urethra in the act of copulation. Near them are the _prostatae_, about
the size of a walnut, and joined to the neck of the bladder. Medical
writers do not agree about the use of them, but most are of the opinion
that they produce an oily and sloppy discharge to besmear the urethra so
as to defend it against the pungency of the seed and urine.
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