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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 ?
4 shows the patient's perineum and scrotum in followup, with no signs of residual mass at two months' followup.
26% (3/92) had delivered at twice contractions, which the shoulder emerged from perineum at the first contraction but returned to vaginal again, then delivered at next contraction.
Moola bandha (moola = root; bandha = lock) - the steady contraction and lifting of the perineum (the muscle between your genitals and anus).
2012), who reported perineum, udder and external genitalia, the most tick infested sites in cattle followed by dewlap, inner thighs, neck and back, tail, ears, around eyes, flanks, and legs.
The perineum is a diamond-shaped space that lies inferior to the muscular pelvic floor.
Although the etiology of the development of such ulceration is unknown, the area covered by the diaper concerns 75% of hemangioma ulcerations (26% at buttocks, 23% at the perineum, 18% around the anal ring, and 5% at the scrotum) [10].
Successful reconstruction of the female anterior perineum after oncologic resections is paramount for restoring genitourinary function and preserving body image and psychological well-being, thus improving quality of life.
In Asia, the traditional belief is that women's perineum is shorter, less flexible and more susceptible to trauma than in other women.
A review article on non-traumatic bicycle injuries found the prevalence of injuries to the knee to be 22-64%, neck 3-49%, hand/wrist 10-70%, buttocks/ perineum 9-61%, back 15-50%, upper leg/hip 2-25%, and lower leg/foot 7-22%.
Trans-sphincteric: Low via internal and external sphincters into the ischiorectal fossa and then to the perineum