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added section Function from WP
the pouch that contains the testes and their accessory organs. It is composed of skin, the tunica dartos, fascia, and the tunica vaginalis testis. Each testis is connected to a cremaster muscle descending from the abdominal wall. During cold weather these muscles draw the testes closer to the body to maintain their temperature, and in hot weather the reverse occurs; the scrotum usually follows this movement.<ref>{{REFweb
|url=https://medical-dictionary.thefreedictionary.com/scrotum
|title=Scrotum
|publisher=The Free Dictionary
|date=2003
|accessdate=2021-12-21
}}</ref></blockquote>
== Function ==
[[File:HQ SAM ST2.jpg|thumb|Human scrotum in a relaxed state (left) and a tense state (right)]]
{{WikipediaQuote |URL=https://en.wikipedia.org/wiki/Scrótum}}
<blockquote>The scrotum regulates the temperature of the testes and maintains it at 35 degrees Celsius (95 degrees Fahrenheit), i.e. two or three degrees below the body temperature of 37 degrees Celsius (99 degrees Fahrenheit). Higher temperatures affect spermatogenesis<ref name="Van de Graaff 1989">{{REFbook
|last=Van de Graaff
|first=Kent M.
|init=KM
|last2=Fox
|first2=Stuart Ira
|init2=SI
|title=Concepts of Human Anatomy and Physiology
|location=Dubuque, {{USSC|IA}}
|publisher=William C. Brown Publishers
|isbn=978-0697056757
|date=1989
|pages=935-6
}}</ref>. Temperature control is accomplished by the smooth muscles of the scrotum moving the testicles either closer to or further away from the abdomen dependent upon the ambient temperature. This is accomplished by the cremaster muscle in the abdomen and the [[dartos]] fascia (muscular tissue under the skin).<ref name="Van de Graaff 1989"/>
Having the scrotum and testicles situated outside the abdominal cavity may provide additional advantages. The external scrotum is not affected by abdominal pressure. This may prevent the emptying of the testes before the sperm were matured sufficiently for fertilization<ref name="Van de Graaff 1989"/>. Another advantage is it protects the testes from jolts and compressions associated with an active lifestyle. Animals that move at a steady pace – such as elephants, whales, and marsupial moles – have internal testes and no scrotum.<ref>{{REFweb
|url=https://www.newscientist.com/article/mg15120432.000-science--bumpy-lifestyle-led-to-external-testes.html
|title=Science : Bumpy lifestyle led to external testes
|date=1996-08-17
|accessdate=2007-11-06
|publisher=New Scientist
}}</ref> Unlike placental mammals, some male marsupials have a scrotum that is anterior to the penis,<ref>{{REFbook
|last=Tyndale-Biscoe
|first=Hugh
|init=H
|last2=Renfree
|first2=Marilyn
|init2=M
|year=1987
|date=1987-01-30
|title=Reproductive Physiology of Marsupials
|publisher=Cambridge University Press
|isbn=978-0-521-33792-2
}}</ref><ref>{{REFbook
|last=Hyman
|first=Libbie Henrietta
|init=LH
|date=1992-15-15
|year=1992
|title=Hyman's Comparative Vertebrate Anatomy
|publisher=University of Chicago Press
|pages=583–
|isbn=978-0-226-87013-7
}}</ref><ref>{{REFbook
|last=Jones
|first=Menna
|init=M
|last2=Dickman
|first2=Chris R.
|init2=CR
|last3=Archer
|first3=Michael
|init3=M
|year=2003
|title=Predators with Pouches: The Biology of Carnivorous Marsupials
|publisher=Csiro Publishing
|isbn=978-0-643-06634-2
}}</ref><ref>{{REFbook
|last=Saunders
|first=Norman
|init=N
|last2=Hinds
|first2=Lyn
|init2=L
|year=1997
|title=Marsupial Biology: Recent Research, New Perspectives
|publisher=UNSW Press
|isbn=978-0-86840-311-3
}}</ref> which is not homologous to the scrotum of placental mammals,<ref>{{REFbook
|last=Armati
|first=Patricia J.
|init=PJ
|last2=Dickman
|first2=Chris R.
|init2=CR
|last3=Hume
|first3=Ian D.
|init3=ID
|date=2006-08-17
|year=2006
|title=Marsupials
|publisher=Cambridge University Press
|isbn=978-1-139-45742-2
}}</ref>
although there are several marsupial species without an external scrotum.<ref>{{REFbook
|last=Tyndale-Biscoe
|first=C. Hugh
|init=CH
|year=2005
|title=Life of Marsupials
|publisher=Csiro Publishing
|isbn=978-0-643-06257-3
}}</ref> In humans, the scrotum may provide some friction during intercourse, helping to enhance the activity.<ref>{{REFbook
|last=Jones
|first=Richard
|init=R
|year=2013
|title=Human Reproductive Biology
|publisher=Academic Press
|page=74
|isbn=9780123821850
|quote=The rear-entry position of mating may allow the scrotum to stimulate the clitoris and, in this way, may produce an orgasm ...
}}</ref>
</blockquote>
{{REF}}