bulbospongiosus muscle


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bul·bo·spon·gi·o·sus mus·cle

(bŭl'bō-spŏn-jē-ō'sŭs mŭs'ĕl)
Perineal muscle; in male: origin, perineal membrane fascia on the dorsum of bulb of penis; insertion, central tendon of perineum and median raphe on free surface of the bulb; action, voluntarily constricts bulbous urethra when attempting to expel last drops after urination, or spasmodically with, and following, ejaculation to expel semen. In female: origin, 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; nerve supply, pudendal (deep perineal branch).
Synonym(s): bulbocavernosus muscle, musculus bulbocavernosus, musculus bulbospongiosus, musculus ejaculator seminis, musculus sphincter vaginae, sphincter vaginae.
References in periodicals archive ?
The ischiocavernosus (see Figure 5-2) and bulbospongiosus muscles lie lateral and dorsal to the base of the penis, respectively.
The incision extends through skin, retractor penis and bulbospongiosus muscles, CSP, and urethral mucosa to expose the lumen of the urethra.