Name | Scrotum |
---|---|
Graysubject | 258 |
Graypage | 1237 |
Caption | Human scrotum (both tense and relaxed states) |
Artery | Anterior scrotal artery & Posterior scrotal artery |
Vein | Testicular vein |
Nerve | Posterior scrotal nerves, Anterior scrotal nerves, genital branch of genitofemoral nerve, perineal branches of posterior femoral cutaneous nerve |
Lymph | Superficial inguinal lymph nodes |
Precursor | labioscrotal folds |
Meshname | Scrotum |
Meshnumber | A05.360.444.661 |
Dorlandspre | s_06 |
Dorlandssuf | 12726162 |
In some male mammals the scrotum (also referred to as the cod or scrot) is a dual-chambered protuberance of skin and muscle containing the testicles and divided by a septum. It is an extension of the perineum, and is located between the penis and anus. In humans and some other mammals, the base of the scrotum becomes covered with curly pubic hairs at puberty. The scrotum is homologous to the labia majora in females.
However, this may not be the main function of the scrotum. The volume of sperm produced by the testes is small (0.1-0.2 ml). It has been suggested that if testes were situated within the abdominal cavity that they would be subjected to the regular changes in abdominal pressure that is exerted by the abdominal muscles. This squeezing and relaxing would result in the more rapid emptying of the testes and epididymis of sperm before the spermatozoa were matured sufficiently for fertilization. Some mammals—elephants and marine mammals, for example—do keep their testes within the abdomen and there may be mechanisms to prevent this inadvertent emptying.
Contraction of the abdominal muscles, and changes in intra-abdominal pressure, often can lift and lower the testicles within the scrotum. Contraction of the muscle fibers of the dartos tunic (or fascia) is completely involuntary and results in the appearance of increased wrinkling and thickening of the scrotal skin. The testicles are not directly attached to the skin of the scrotum, so this dartos contraction results in their sliding toward the abdomen. They also, in some men, can be lifted the same way by tightening the anus and pelvic muscles, doing Kegel exercises. has been opened; on the right side only the layers superficial to the Cremaster muscle have been removed.]] Although the ideal temperature for sperm growth varies between species, it usually appears, in warm-blooded species, to be a bit cooler than internal body temperature, necessitating the scrotum. Since this leaves the testicles vulnerable in many species, there is some debate on the evolutionary advantage of such a system. One theory is that the impregnation of females who are ill is less likely when sperm is highly sensitive to elevated body temperatures. An alternative explanation is to protect the testes from jolts and compressions associated with an active lifestyle. Animals that have stately movements—such as elephants, whales, and marsupial moles—have internal testes and no scrotum.
Nerve !! Surface | |
genital branch of genitofemoral nerve | anterolateral |
Anterior scrotal nerves (from ilioinguinal nerve) | anterior |
Posterior scrotal nerves (from perineal nerve) | posterior |
perineal branches of posterior femoral cutaneous nerve | inferior |
Other conditions include:
Category:Male reproductive system
af:Skrotum ar:صفن an:Escroto arc:ܟܝܣܐ ܕܐܫܟܐ zh-min-nan:Im-lông be:Машонка be-x-old:Машонка bs:Skrotum bg:Скротална торба ca:Escrot cs:Šourek da:Skrotum de:Hodensack el:Όσχεο es:Escroto eo:Skroto fa:کیسه خایه fr:Scrotum ga:Cadairne gl:Escroto ko:음낭 hr:Mošnja io:Skroto id:Skrotum is:Pungur it:Scroto he:כיס האשכים jv:Skrotum pam:Scrotum kk:Ұма la:Scrotum lt:Kapšelis hu:Herezacskó ml:വൃഷണസഞ്ചി nl:Scrotum ja:陰嚢 no:Pung nn:Skrotum nds:Klötensack pl:Moszna (anatomia) pt:Escroto qu:Q'uruta ch'uspa ru:Мошонка simple:Scrotum sk:Miešok sr:Мошнице su:Kanjut fi:Kivespussi sv:Scrotum tl:Eskroto tr:Testis torbası uk:Калитка vi:Bìu dái zh-yue:春袋 zh:阴囊This text is licensed under the Creative Commons CC-BY-SA License. This text was originally published on Wikipedia and was developed by the Wikipedia community.
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