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Related to bulbocavernosus: Bulbocavernosus Reflex
perineal muscle; in the male: origin, the perineal membrane fascia on the dorsum of the bulb of the penis; insertion, central tendon of the perineum and the median raphe on the free surface of the bulb; action, voluntarily constricts bulbous urethra when attempting to expel last drops after urination, or spasmodically with, and after, ejaculation to expel semen. In the female: origin, the dorsum of the clitoris, the corpus cavernosum, and the perineal membrane; insertion, central tendon of the perineum; action, acts as a weak sphincter of the vagina; when developed, is a part of "cross-member musculature" of pelvic floor that resists prolapse of pelvic viscera; surrounds and compresses greater vestibular gland, especially during erection of bulb of vestibule, expressing secretion. Nerve supply, pudendal (deep perineal branch).
bulbocavernosus/bul·bo·cav·er·no·sus/ (bul″bo-kav″er-no´sus) bulbocavernous muscle.
Etymology: L, bulbus, swollen root, cavernosum, full of hollows
bulbocavernosus(bŭl″bō-kăv″ĕr-nō′sŭs) [″ + cavernosus, hollow]
A muscle ensheathing the bulb of the penis in the male or covering the bulbus vestibuli in the female. It is also called ejaculator urinae or accelerator urinae in males and sphincter vaginae in females.