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{{GraphicWarning}}
[[File:Figure 28 01 06.jpg|thumb|Three columns of erectile tissue make up most of the volume of the penis.]]
'''Erection''' is defined as:
# the condition of becoming rigid and elevated, as erectile tissue when filled with blood.
# especially the swelling and rigidity that occur in the [[Corpus cavernosum penis|two corpora cavernosa and corpus spongiosum]] of the [[penis]] as a result of sexual or other types of stimulation. Impulses received by the nervous system stimulate a flow of blood from the arteries leading to the [[penis]], where the erectile tissue fills with blood, and the penis becomes firm and erect. Erection makes possible the transmission of [[semen ]] into the body of the female. Erection can also occur to some extent in the [[clitoris]] and the nipples of the female.<ref>{{REFweb
|url=https://medical-dictionary.thefreedictionary.com/erection
|title=Erection
}}</ref>
== Side views and comparison of the stages human penis erection ==
<gallery widths=300px heights=200px>
Image:Erection Development V2.jpg|uncircumcised
Image:Circumcised human penis erection stages.jpg|circumcised
</gallery>
[[Circumcised]] males may experience tight and/or painful erections if there is insufficient residual shaft [[skin]] to permit full expansion and extension of the shaft of the [[penis]] during erection. [[Tissue expansion]] may relieve the pain and tightness.
== Video==
=== How does an erection occur in men ? ===
<youtube>v=52vH6gDUVI8</youtube>
{{SEEALSO}}
* [[Circumcision: Effect upon erectile function]]
* [[Excessive skin removal]]
{{REF}}
[[Category:Medical term]]
[[Category:Male sexuality]]
[[Category:Penis]]
[[Category:Physiology]]
[[de:Erektion]]