Crotch

Crotch. Under the crotch, perineum, in the narrow sense of the word means the tissue site between the anterior margin of the anus and the posterior edge of the external genitalia (the root of the scrotum in men, the posterior edge of the genital cleft in women). In the topographic anatomy, the perineum is the area of ​​the exit of the small pelvis.

The area is filled with the external genitalia and the anal part of the rectum. The perineum region is rhomboid; In front, it extends to the lower edge of the pubic symphysis, from behind - to the top of the coccyx and on the sides is limited by pubic and ischial bones and sacro-tubercular ligaments, ligg. Sacrotuberalia, separating from the hip by a cutaneous femoral-perineal fold.

The perineal region, regio perinealis, forms the pelvic floor, closing the outlet from it, and is divided into the anterior urogenital region, regio urogenitalis, and the posterior anal region, regio analis.

The exit from the cavity of the small pelvis is closed by muscles, fascia, fat and skin. Slightly convex toward the front, the line connecting the right and left sciatic mounds is the boundary of these two regions.

The skin fold located along the mid-sagittal line - the perineal seam, raphe perinealis, as it divides the skin of this area on the right and left halves.

In the genitourinary region, regio urogenitalis, the external genitalia, urethra and urogenital diaphragm, diaphragma urogenitale are located. Through the urogenital diaphragm in men passes the urethra , and in women - the urethra and the vagina .

In the anal region, regio analis, is located the anal canal, canalis analis, rectum with anus, anus, external anal sphincter, m. Sphincter ani externus, and the diaphragm of the pelvis, diaphragma pelvis.

These diaphragms - urogenital, diaphragma urogenitalis, and pelvic, diaphragma pervis, take part in the formation of the pelvic floor.

All perineal muscles, mm. Perinei, divide into the muscles of the end section of the intestine, which are part of the anal region, and the muscles of the outer genital parts, related to the urogenital area.