Everything about Bulbospongiosus Muscle totally explained
Bulbospongiosus (
bulbocavernous 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's innervated by the deep/muscular branch of the
perineal nerve, which is a branch of the
pudendal nerve.
Action
In males it contributes to
erection,
ejaculation, and the feelings of
orgasm. In females it contributes to
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, according to Tyrrel, also contribute to the erection of the penis by compressing the
deep dorsal vein of the penis as they're inserted into, and continuous with, the fascia of the penis.
Location
The Bulbocavernosus is placed in the middle line of the
perineum, in front of the
anus. It consists of two symmetrical parts, united along the median line by a tendinous
raphé.
It arises from the central tendinous point of the
perineum and from the
median raphé in front.
Fibers
Its fibers diverge like the barbs of a quill-pen; the most posterior form a thin layer, which is lost on the inferior fascia of the
urogenital diaphragm; the middle fibers encircle the bulb and adjacent parts, of the
corpus cavernosum urethræ, and join with the fibers of the opposite side, on the upper part of the corpus cavernosum urethræ, in a strong
aponeurosis; the anterior fibers, spread out over the side of the corpus cavernosum
penis, to be inserted partly into that body, anterior to the
Ischiocavernosus, occasionally extending to the pubis, and partly ending in a tendinous expansion which covers the dorsal vessels of the penis.
The latter fibers are best seen by dividing the muscle longitudinally, and reflecting it from the surface of the corpus cavernosum urethræ.
Additional images
Image:Gray407.png|Coronal section of anterior part of pelvis, through the pubic arch. Seen from in front.
Image:Gray542.png|The superficial branches of the internal pudendal artery.
Further Information
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