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1. the region of the body between the anus and the genital organs, including some of the underlying structures
2. the nearly diamond-shaped surface of the human trunk between the thighs



in man, the anatomical region that comprises the pelvic floor and is located between the apex of the coccyx posteriorly, the apex of the subpubic arch anteriorly, and the ischial tuberosities laterally.

In obstetrics, the perineum is the space between the anus and the posterior commissure of the labia majora. Its bony foundation includes the pelvic ischial tuberosities, the pubic bone, and the coccyx. The perineum also contains muscles, ligaments, fatty tissue, vessels, nerves, and some internal organs. Shaped like a rhombus, it is divided into two triangles by a line that joins the ischial tuberosities; the male urethra or the female urethra and vagina pass through the anterior urogenital triangle. The rectum passes through the posterior, or anal, triangle.

Injuries to the perineum can consist of closed or open wounds. They arise most often with fractures of the pelvic bone when there is a great displacement of fragments (indirect mechanism) or with a blow to the perineum (direct mechanism). On the average, 10 percent of all women suffer perineal ruptures during childbirth, most often with the birth of the first child. The most common diseases of the perineum are suppurative processes near the rectum upon injuries to the rectal mucosa. Surgery is required to treat injuries and suppurative diseases of the perineum.


The portion of the body included in the outlet of the pelvis, bounded in front by the pubic arch, behind by the coccyx and sacrotuberous ligaments, and at the sides by the tuberosities of the ischium.
The region between the anus and the scrotum in the male, between the anus and the posterior commissure of the vulva in the female.
References in periodicals archive ?
The differences in anogenital distance in female offspring in response to maternal CAPs exposure were more dramatic than those observed in their age-matched male counterparts because AGD was significantly (p = 0.
Besides the weight gain, the other physical parameters that have been altered were the pinna detachment and anogenital distance in male offspring.
They found that the infertile men possessed a significantly shorter anogenital distance and penile length when compared with the fertile men.
Preliminary results from a multicenter study found a 10-fold higher likelihood of a reduced anogenital distance in boys born to women exposed to high levels versus low levels of a certain phthalate, a compound used in making plastics and other products in everyday use.
In people, the anogenital distance "is not a measurement that is typically made," notes J.
The researchers then measured genital features in the infants, including anogenital distance, and correlated them with their moms' prenatal phthalate values.
Shorter anogenital distance correlates with undescended testis: a detailed genital anthropometric analysis in human newborns.
We've never seen anything in our rats that increases anogenital distance in both sexes," he notes.
We calculated the distribution of anthropometric measures at birth and the anogenital distance as well as the correlations (Spearman correlation coefficients) between the genital measures among the boys and among the girls.
Human chorionic gonadotropin partially mediates phthalate associations with male and female anogenital distance.
The relationship between anogenital distance, fatherhood, and fertility in adult men.