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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 ?
Data collected were: parity, age at time of pregnancy, type of delivery (normal vaginal or vaginal with vacuum extraction), state of perineum (intact, torn and/or episiotomy), infant birth weight, mother's height, mother's weight gain during pregnancy.
Pain usually gets progressively worse through the day Patients often will report the sensation of having a foreign body, frequently described as a golf ball or tennis ball, in the vagina, perineum, or rectum.
Aggressive angiomyxoma of the perineum originating from the rectal wall.
Differential diagnosis for a cystic lesion in the perineum includes a tail gut cyst (a developmental lesion lined with gastrointestinal epithelium which would be retro-rectal (7), perineal median raphe cysts (8) or urethral and seminal vesicle cysts which would be connected to the urological system.
McCandlish (2001) observes that suturing second degree trauma to the perineum has also been standard practice in the UK for many years.
Follow-up examination determined that he carried MRSA also in the perineum and in a chronic external otitis eczema.
This channel originated near the upper level of the TURP defect, extended posteroinferiorly toward the anus, and opened onto the perineum (Figure 1).
During the course of delivery, she suffered a lacerated perineum.
6) Children under 6 years of age, because of their small size, were more likely to sustain injuries to the head, face or neck, and older children injuries to the perineum, buttocks, legs or feet.
Patients cannot have urinated in the past hour, they should not cleanse the perineum before sampling, they should collect the first part of the urinary stream, and they should collect only as much urine as the test requires.
His first comedy show, Navel, received Green Room Award nominations for Most Innovative Use of Form and Most Outstanding Songwriter, while his second, Perineum Millennium, earned nominations for Best Cabaret Artist and Most Outstanding Songwriter.
We then lift and engage the muscles located at the perineum and belly.