"Bulbospongiosus (bulbocavernosus in older texts) is one of the superficial muscles of the perineum. It has a slightly different origin, insertion and function in males and females. In males, it covers the bulb of the penis. In females, it covers the vestibular bulb.
In both sexes, it is innervated by the deep/muscular branch of the perineal nerve, which is a branch of the pudendal nerve.
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In males it contributes to erection, ejaculation, and the feelings of orgasm. In females it contributes to clitoral erection and the feelings of orgasm, and closes the vagina.
This muscle serves to empty the canal of the urethra, after the bladder has expelled its contents; during the greater part of the act of micturition its fibers are relaxed, and it only comes into action at the end of the process.
The middle fibers are supposed by Krause to assist in the erection of the corpus cavernosum urethræ, by compressing the erectile tissue of the bulb.
The anterior fibers also contribute to the erection of the penis by compressing the deep dorsal vein of the penis as they are inserted into, and continuous with, the fascia of the penis."
http://en.wikip edia.org/wiki/B … ongiosus_muscle
"…, I have to point out that men contract a different muscle than women when doing Kegels and it isn’t the PC (pubococcygeus). It’s actually the BC (bulbocavernosus). This is probably the only place on the Internet where you’ll find this distinction. Most will probably find it easier to “go with the flow” and conform to years of misconception by just calling it the PC."
Relaxing the BC and pushing to urinate are two different things. The first one is no point, the second one can sprain the bladder and cause a pelvic floor disorder.
Locating the bc muscle