human_reference_atlas Homo sapiens perineal muscle bulbospongiosus muscle bulbospongiosus The bulbospongiosus is the thick extrapelvic continuation of the urethralis. It originates from the perineal body (and midline raphe over corpus spongiosum in male) and inserts at the superficial perineal membrane and dorsal penile or clitoral aponeurosis. In males, the bulbospongiosus muscles are united and surround the base of the penis. They aid in emptying of urine and ejaculate from urethra. In females, these muscles are separated in the middle by the vagina and act to constrict the vaginal introitus. They can also stop the flow of blood into veins, which maintains an erection in the penis of the male and the clitoris of the female. Its nerve connection is the perineal branch of the pudendal nerve (S2, 3, 4). uberon EMAPA:37454 bulbocavernous AS UBERON:0011389 MA:0003116 musculus bulbospongiosus SCTID:244972001 FMA:19729 bulbocavernosus muscle bulbospongiosus muscle bulbospongiosus bulbocavernosus NCIT:C112234 bulbospongiosus muscle Wikipedia:Bulbospongiosus_muscle