Sex organ
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{{Unreferenced|date=June 2007}}
A '''sex organ''', or '''primary sexual characteristic''', as narrowly defined, is any of the anatomical parts of the body which are involved in sexual reproduction and constitute the [[reproductive system]] in a complex organism; in mammals, these include:
*[[Female]]
**[[Bartholin's gland]]s
**[[cervix]]
**[[clitoris]]
**[[clitoral hood]]
**[[clitoral glans]] (glans clitoridis)
**[[Fallopian tube]]s
**[[labium (genitalia)|labium]]
**[[ovary|ovaries]]
**[[Skene's gland]]
**[[uterus]]
**[[vagina]]
**[[vulva]]
*[[Male]]
**[[bulbourethral gland]]s
**[[epididymis]]
**[[penis]]
**[[foreskin]]
**[[glans penis]]
**[[prostate]]
**[[scrotum]]
**[[seminal vesicle]]s
**[[testicle]]s
The [[Latin]] term '''genitalia''', sometimes anglicized as '''genitals''' and '''genital area''', is used to describe the externally visible [[sex]] organs, known as '''primary genitalia''' or '''external genitalia''': in males the [[penis]], in females the [[clitoris]] and [[vulva]].
The other, hidden sex organs are referred to as the '''secondary genitalia''' or '''internal genitalia'''. The most important of these are the [[gonad]]s, a pair of sex organs, specifically the [[testis|testes]] in the male or the [[ovary|ovaries]] in the female. Gonads are the true sex organs, generating reproductive [[gamete]]s containing inheritable DNA. They also produce most of the primary hormones that affect sexual development, and regulate other sexual organs and sexually differentiated behaviors.
A more ambiguously defined term is [[erogenous zone]], subjectively, any portion of the body that when stimulated produces erotic sensation, but always prominently including the genitalia.
==Development==
{{Main|Development of the reproductive system}}
It is only in males
In typical [[prenatal development]], sexual organs originate from a common [[anlage]] anatomy during early [[gestation]] and differentiate into male or female variations. The [[SRY]] [[gene]], usually located on the [[Y chromosome]] and encoding the [[testis determining factor]], determines the direction of this differentiation. The absence of it allows the gonads to continue to develop into ovaries.
Thereafter, the development of the [[sex organ|internal reproductive organs]] and the [[external genitalia]] is determined by hormones produced by certain fetal gonads (ovaries or testes) and the cells' response to them. The initial appearance of the [[fetal genitalia]] (a few weeks after conception) looks basically feminine: a pair of "[[urogenital folds]]" with a small protuberance in the middle, and the [[urethra]] behind the protuberance. If the fetus has testes, and if the testes produce testosterone, and if the cells of the genitals respond to the testosterone, the outer urogenital folds swell and fuse in the midline to produce the scrotum; the protuberance grows larger and straighter to form the penis; the inner urogenital swellings grow, wrap around the penis, and fuse in the midline to form the penile urethra.
Each sexual organ in one sex has a [[homology (biology)|homologous]] counterpart in the other one. See a [[list of homologues of the human reproductive system]].
In a larger perspective, the whole process of [[sexual differentiation]] also includes development of [[secondary sexual characteristics]] such as patterns of pubic and facial hair and female breasts that emerge at puberty. Furthermore, differences in brain structure arises, affecting, but not absolutely determining, behavior.
==Anatomical terms related to sex==
The following is a list of anatomical terms related to sex and sexuality:
*[[areola]]
*[[Bartholin's gland]]
*[[breast]]
*[[bulbospongiosus muscle]]
*[[bulbourethral gland]]
*[[cervix]]
*[[cleft of venus]]
*[[clitoris]]
*[[corona of glans penis]]
*[[corpus cavernosum clitoridis]]
*[[corpus spongiosum penis]]
*[[cremaster muscle]]
*[[dartos]]
*[[deep perineal pouch]]
*[[Egg (biology)|eggs]]
*[[ejaculatory duct]]
*[[endometrium]]
*[[epididymis]]
*[[Fallopian tube]]
*[[foreskin]]
*[[frenulum]]
*[[frenulum clitoridis]]
*[[frenulum labiorum pudendi]]
*[[frenulum of prepuce of penis]]
*[[fundiform ligament]]
*[[G-spot]]
*[[Gartner's duct]]
*[[genital tubercle]]
*[[genitofemoral nerve]]
*[[glans]]
*[[glans penis]]
*[[hymen]]
*[[internal pudendal artery]]
*[[intromittent organ]]
*[[ischiocavernosus muscle]]
*[[labia majora]]
*[[labia minora]]
*[[labium (genitalia)|labium]]
*[[mammary gland]]
*[[urinary meatus|meatus]]
*[[mons pubis]]
*[[Müllerian duct]]
*[[nipple]]
*[[ovary]]
*[[ovum]]
*[[penile artery]]
*[[penis]]
*[[perineum]]
*[[prepuce]]
*[[prostate]]
*[[pubic hair]]
*[[pubic symphysis]]
*[[pubococcygeus muscle]]
*[[pudendal nerve]]
*[[Perineal raphe|raphe]]
*[[ridged band]]
*[[scrotum]]
*[[seminal vesicle]]
*[[seminiferous tubules]]
*[[Skene's glands]]
*[[spermatic cord]]
*[[spermatozoon]]
*[[splanchnic nerves]]
*[[testicle]]
*[[tunica albuginea (testicles)|tunica albuginea]]
*[[urethra]]
*[[urethral sphincter]]
*[[urethral sponge]]
*[[uterus]]
*[[vagina]]
*[[vas deferens]]
==See also==
<div class="references-small" style="-moz-column-count:2; column-count:2;">
*[[Castration]]
*[[Circumcision]]
*[[Genital modification and mutilation]]
*[[Human sexuality]]
*[[Hysterectomy]]
*[[Intersexuality]]
*[[Intimate part]]s
*[[List of transgender-related topics]]
*[[Mastectomy]]
*[[Obstetrics and gynaecology]]
*[[Oophorectomy]]
*[[Secondary sex characteristic]]s
*[[Sex]]
*[[Human sexual behavior]]
*[[Sexual intercourse]]
*[[List of sex positions]]
</div>
{{human anatomical features}}
{{Organ systems}}
[[Category:Sexual anatomy]]
[[Category:Sex organs]]
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[[ar:عضو جنسي]]
[[cs:Genitálie]]
[[cy:System atgenhedlol]]
[[da:Kønsorgan]]
[[de:Geschlechtsorgan]]
[[el:Γεννητικά όργανα]]
[[fa:اندام جنسی]]
[[fr:Appareil reproducteur]]
[[hr:Spolni organi]]
[[id:Alat kelamin]]
[[it:Apparato genitale]]
[[lt:Lytiniai organai]]
[[mr:गुप्तांग]]
[[nl:Geslachtsorgaan]]
[[ja:生殖器]]
[[no:Kjønnsorgan]]
[[nn:Kjønnsorgan]]
[[pt:Órgão sexual]]
[[simple:Sex organ]]
[[sk:Rozmnožovacia sústava]]
[[sl:Spolni organ]]
[[fi:Sukupuolielin]]
[[sv:Könsorgan]]
[[tl:Kasangkapang pangkasarian]]
[[th:อวัยวะเพศ]]
[[tr:Üreme sistemi]]
[[uk:Статеві органи]]
[[zh-yue:生殖器]]
[[zh:生殖器]]