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== Erection ==
== Erection ==
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When sexual receptivity of the female is established and sufficient arousal is accomplished in the male, erection and protrusion of the penis ensue. Successful penile erection requires a complex series of neural and vasomotor reactions. Erection of the penis is necessary for copulation and deposition of [[Copulation_-Sperm_in_the_Female_Tract_-_Anatomy_%26_Physiology|semen in the female reproductive tract]].
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== Introduction ==
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* When sexual receptivity of the female is established and sufficient arousal is accomplished in the male, erection and protrusion of the penis ensue.
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* Successful penile erection requires a complex series of neural and vasomotor reactions.
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* Erection of the penis is necessary for copulation and deposition of [[Copulation_-Sperm_in_the_Female_Tract_-_Anatomy_%26_Physiology|semen in the female reproductive tract]].
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* Erection is characterized by a marked increase in rigidity of the penis.
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* Increased rigidity is the result of increase in arterial inflow of blood compared to venous outflow.
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* Erection requires that blood be trapped within the cavernous sinus of the penis.
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* Increased blood flow to the penis is brought about by vasodilation of the arterioles supplying it.
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== Erection of the Fibroelastic Penis ==
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== Erection of the Musculovascular Penis ==
== Penile Protrusion ==
== Penile Protrusion ==