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The '''penis''' is the external male organ of [[urination ]] and copulation.<ref name="farlex2003">{{REFweb
|url=https://medical-dictionary.thefreedictionary.com/penis
|archived=
}}</ref> The penis is also known as the '''phallus'''.
The body of the penis consists of three cylindrical-shaped masses of erectile tissue which run the length of the penis. Two of the masses lie alongside each other and end behind the head of the penis. The third mass lies underneath them. This latter mass contains the [[urethra]]. The penis terminates in an oval or cone-shaped body, the [[glans penis]], which contains the exterior opening of the [[urethra]], or [[meatus]].<ref name="farlex2003" />
The normal [[intact]], [[foreskinned]] penis is enveloped by in a tube of loose, highly innervated, movable, erogenous skin, <ref name="winklemann1959">{{WinkelmannRK 1959}}</ref> the [[foreskin]] or prepuce, which enables it to expand freely during [[erection]]. <ref name="earp2018">{{REFjournal |last=Earp |first= |init=BD |author-link=Brian D. Earp |last2=Steinfeld |first2= |init2=R |author2-link= |etal=no |title=Genital autonomy and sexual well-being |trans-title= |language= |journal=Current Sexual Health Reports |location= |date=2018 |volume=10 |issue=1 |article= |pages=7-17 |url=https://www.academia.edu/35660699/Genital_autonomy_and_sexual_well_being?email_work_card=view-paper |archived= |quote= |pubmedID= |pubmedCID= |DOI=10.1007/s11930-018-0141-x |accessdate=2024-01-02}}</ref> The skin ends just behind the [[glans penis]] but folds forward to cover it, this forming the [[preputial sac]] and, if long enough, the [[acroposthion]]. The inner surface of the foreskin contains glands that secrete a lubricating fluid that mixes with exfoliated tissue to form moist preputial sac may harmlessly collect oil-bearing [[smegma]] , which makes it easy for is helpful in preventing dermatitis.<ref name="birley1993">{{REFjournal |last=Birley |init=HDL |author-link= |last2=Walker |init2=MM |author2-link= |last3=Luzzi |init3=GA |author3-link= |last4=Bell |init4=R |author4-link= |etal=yes |title=Clinical Features and management of recurrent balanitis; association with atopy and genital washing] |trans-title= |language= |journal=Genitourin Med |location= |date=1993-10 |volume=69 |issue=5 |pages=400-3 |url=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1195128/pdf/genitmed00029-0074.pdf |quote= |format=PDF |pubmedID=8244363 |pubmedCID=1195128 |DOI=10.1136/sti.69.5.400 |accessdate=2023-11-29}}</ref> The skin of the adult penis to expand and retract past normally is somewhat darker than the rest of the [[foreskin]]body. This condition is called ''hyperpigmentation''.
== Innervation ==
The penis — the organ of copulation — is heavily innervated with afferent<ref>{{REFweb
|accessdate=2023-11-24
}}</ref> nerves — meaning that sensation, which is needed for male sexual function, is transmitted to the spinal cord and/or central nervous system. The penis is also innervated by the sympathetic autonomic nervous system (SAMS) and parasympathetic autonomic nervous system (PAMS).<ref name="cepeda2023">{{REFjournal
|last=Cepe daCepeda-Emiliani
|first=
|init=A
|DOI=10.1038/s41443-022-00561-9
|accessdate=2023-11-24
}}</ref> The penis may be is innervated by both dorsal and perineal nerves.<ref name="cepeda2023" />
The innervation in the tube of [[foreskin ]] translates movement and stretching into pleasurable sensation.<ref name="garcía-mesa2021">{{REFjournal |last=García-Mesa |first=Yolanda |init= |author-link= |last2=García-Piqueras |first2=Jorge |init2= |author2-link= |last3=Cobo |first3=Ramón |init3= |author3-link= |last4=Martín-Cruces |first4=José |init4= |author4-link= |last5=Suazo |first5=Iván |init5= |author5-link= |last6=García-Suárez |first6=Olivia |init6= |author6-link= |last7=Feito |first7=Jorge |init7= |author7-link= |last8= |first8=Vega |init8=José A. |author8-link= |etal=no |title=Sensory innervation of the human male prepuce: Meissner's corpuscles predominate |trans-title= |language= |journal=Journal of Anatomy |location= |date=2021-10 |volume=239 |issue=4 |article= |page= |pages=892-902 |url=https://onlinelibrary.wiley.com/doi/full/10.1111/joa.13481 |pubmedID=34120333 |pubmedCID=8450466 |DOI=10.1111/joa.13481 |accessdate=2023-11-26}}</ref> <ref>{{REFweb |url=https://intactamerica.org/what-do-the-eyelids-lips-fingertips-the-intact-penis-have-in-common/ |title=What Do The Eyelids, Lips, Fingertips & The Intact Penis Have in Common? |last=Anonymous |first= |init= |publisher=Intact America |date=2024-02-17 |accessdate=2024-02-18}}</ref>
==Parts==
The growing together of the folds results in the seam that runs from the underside of the scrotum and the penile shaft up to the tip of the foreskin. The penis now consists of the shaft containing the erectile tissue, with the glans at the top. The shaft is surrounded by the [[shaft skin]] which, however, is not knitted to it. This mobility, combined with the [[stretching]] capabilities of the [[skin]], allows for the growth in dimension of the penis during an [[erection]]. During an [[erection]] the erectile tissue fills with blood, giving the penis its stiffness and enlarged size.
In the area of the [[glans]] the [[shaft skin]] transitions into the outer layer of the [[foreskin]], which extends past the tip of the [[glans]]. Parallel to that runs the inner layer of the [[foreskin]]. It is attached behind the rim of the [[glans]], and runs between the [[glans ]] and the outer [[foreskin ]] layer, also past the tip of the [[glans]]. At the tip, the inner and outer [[foreskin ]] layers are joined together.
This junction makes up the [[ridged band]]. At the underside of the penis, in the area of the seam, the inner foreskin layer is connected to the glans by the [[frenulum]].
[[File:Circumpendium-2-penis-1-English.jpg|center|400px]]
Like the [[shaft skin]], the [[foreskin ]] layers are neither fused to the penis, nor to each other, but are moveable against each other. This enables the foreskin to be retracted all the way past the glans until it is stopped by the [[frenulum]].
[[File:Circumpendium-2-penis-2-English.jpg|center|400px]]
At the time of birth, the development of the external male genital organs is not completely finished. At this stage, the [[foreskin ]] and [[glans ]] share an epithelium (mucous layer, the balano-preputial membrane) that fuses the two together. It serves to protect the [[glans]] during infancy, and dissolves as the child develops. Premature forcible [[retraction of the foreskin]] will tear this membrane, causing great [[pain ]] and injury to the boy, who suffers this abuse. The child, himself, should be the first person to retract his foreskin.<ref>{{REFjournal
|last=Wright
|init=JE
Only then the [[foreskin]] can be retracted. The age at which this occurs is subject to the child's individual development. If the foreskin is retracted prematurely, before it has fully separated, that can result in painful tears and infections.
The widening of the [[foreskin]] also depends on age. A child's [[foreskin ]] may be too tight to be retracted all the way past the [[glans]], even though it has already completely separated from the glans. This early [[foreskin ]] tightness, frequently confused with ([[phimosis]]), is a normal stage of development and vanishes with increasing age in most boys.
A study by the Danish paediatrician and school doctor, [[Jakob Øster]], of 9,545 examinations of pupils, published in 1968, led to the following results<ref>{{OesterJ 1968}}</ref>:
|accessdate=2019-10-01
}}</ref> Non-retractile foreskin is the more common condition until about 10-11 years of age.
== Penis size ==
The average length of the adult penis is 5.5 inches or 14 centimeters. The average girth is 4.6 inches or 11.7 centimeters.<ref>{{REFweb
|url=https://unravelingsize.wordpress.com/
|title=Unravelling size
|last=
|first=
|init=
|publisher=
|website=wordpress.com
|date=
|accessdate=2023-12-29
}}</ref>
== Video ==
<br>
<youtube>v=4qbUdVk-QvE</youtube>
<br>
<b>What Happens to Your Penis As You Age? A Doctor Explains</b>
<youtube>v=2ixNxjJOJu0</youtube>
{{SEEALSO}}
* [[Circumcision - Penis SensitivityTest]]
* [[Erection]]
* [[Foreskin sensitivity]]
* [[Gliding action]]
* [[Meissner's corpuscles]]
{{LINKS}}
* {{REFbook
|accessdate=2023-11-08
|note=
}}
* {{REFweb
|url=http://www.intactaus.org/information/functionsoftheforeskin/
|title=Functions of the Foreskin
|last=
|first=
|init=
|publisher=Intact Australia
|date=
|accessdate=2024-01-14
}}
{{REF}}
[[Category:Genital]]
[[Category:Male sexuality]]\[[Category:Medical_term]]
[[Category:Penile anatomy]]
[[Category:Physiology]]
[[de:Penis]]