Читать книгу Ridley's The Vulva - Группа авторов - Страница 82

The internal pudendal artery, a branch of the internal iliac artery, leaves the pelvis through the greater sciatic notch below the piriformis muscle. Lying on the tip of the ischial spine, it turns forwards through the lesser sciatic foramen to enter the anal triangle posteriorly. Within this triangle it runs forwards on the side wall of the ischiorectal fossa enclosed by the fascia of the pudendal canal. During its course through the ischiorectal fossa, it gives off the inferior rectal artery, which arches over the fascial roof of the fossa to reach and supply the anococcygeal raphe, anal canal, and perineal body. After entering the urogenital triangle, the internal pudendal artery gives off the perineal branch to the perineal body and the posterior structures in the superficial perineal pouch. It enters the deep perineal pouch and supplies the erectile tissue lying in the vestibule, by perforating branches into the superficial perineal pouch, and the clitoris, by way of its deep and superficial terminal branches through the apex of the urogenital diaphragm.