- alternative form of genitalia
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 are:
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 gonads, a pair of sex organs, specifically the testes in the male or the ovaries in the female. Gonads are the true sex organs, generating reproductive gametes 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.
DevelopmentIn 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 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 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 sexThe following is a list of anatomical terms related to sex and sexuality:
- Bartholin's gland — breast — bulbospongiosus muscle — bulbourethral gland
- cervix — Cleft of Venus — clitoris — common penile artery — corona glandis — corpus cavernosum (pl. corpora cavernosa) — corpus spongiosum — Cowper's glands — cremaster muscle
- dartos muscle — ductus deferens
- ejaculatory duct — endometrium — epididymis --- eggs
- Fallopian tube — foreskin — frenulum — frenulum preputii penis — frenulum labiorum pudendi — frenulum clitoridis — frenum — fundiform ligament
- G-Spot — Gartner's duct — genital tubercle — genitofemoral nerve — glans — glans penis — Gräfenberg spot
- internal pudendal artery — intromittent organ — ischiocavernosus muscle
- labium — labia majora — labia minora
- mammae — mammary gland — meatus — mons pubis — mons veneris — Mullerian duct
- ovary — ovum — oviducts
- penis — perineum — prepuce — prostate — pubic hair — pubic symphysis — pubococcygeus muscle — pudendal nerve
- raphe — ridged band
- scrotum — seminal vesicles — semeniferous tubules — Skene's glands — spermatozoon — spermatic cord — sphincter urethrae membranaceae — splanchnic nerves
- testes — testicle — tunica albuginea
- urethra — urethral sponge — urogenital diaphragm — uterus
- vas deferens — vagina
genitals in Arabic: عضو جنسي
genitals in Czech: Genitálie
genitals in Welsh: System atgenhedlol
genitals in Danish: Kønsorgan
genitals in German: Geschlechtsorgan
genitals in Modern Greek (1453-): Γεννητικά όργανα
genitals in Persian: اندام جنسی
genitals in French: Appareil reproducteur
genitals in Croatian: Spolni organi
genitals in Indonesian: Alat kelamin
genitals in Italian: Apparato genitale
genitals in Lithuanian: Lytiniai organai
genitals in Dutch: Geslachtsorgaan
genitals in Japanese: 生殖器
genitals in Norwegian: Kjønnsorgan
genitals in Norwegian Nynorsk: Kjønnsorgan
genitals in Portuguese: Órgão sexual
genitals in Russian: Репродуктивная система
genitals in Simple English: Sex organ
genitals in Slovak: Rozmnožovacia sústava
genitals in Slovenian: Spolni organ
genitals in Finnish: Sukupuolielin
genitals in Swedish: Könsorgan
genitals in Tagalog: Kasangkapang pangkasarian
genitals in Thai: อวัยวะเพศ
genitals in Turkish: Üreme sistemi
genitals in Ukrainian: Статеві органи
genitals in Chinese: 生殖器
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