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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.

Structure

The bulbospongiosus is located 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.

Function

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.

Gallery

Coronal section of anterior part of the male pelvis, through the pubic arch. Seen from in front.
The superficial branches of the internal pudendal artery in the male.

References

This article incorporates text from a public domain edition of Gray's Anatomy.

External links

Wikimedia Commons has media related to Bulbospongiosus muscle.

Origin, insertion and nerve supply of the muscle at Loyola University Chicago Stritch School of Medicine
-838467507 at GPnotebook
Anatomy photo:41:11-0102 at the SUNY Downstate Medical Center—"The Female Perineum: Muscles of the Superficial Perineal Pouch"
SUNY Figs 42:04-02—"Muscles of the male superficial perineal pouch."
SUNY Figs 43:04-11—"The urinary bladder and the urethra as seen in a frontal section of the female pelvis."
SUNY Anatomy Image 9162
SUNY Anatomy Image 9197

UpToDate Contents

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English Journal

Muscle spindles in the human bulbospongiosus and ischiocavernosus muscles.

Peikert K1, May CA1.
Muscle & nerve.Muscle Nerve.2015 Jul;52(1):55-62. doi: 10.1002/mus.24500. Epub 2015 May 14.
INTRODUCTION: Muscle spindles are crucial for neuronal regulation of striated muscles, but their presence and involvement in the superficial perineal muscles is not known.METHODS: Bulbospongiosus and ischiocavernosus muscle specimens were obtained from 31 human cadavers. Serial sections were stained
PMID 25363905

Aromatase expression is linked to estrogenic sensitivity of periurethral muscles in female rabbits.

de Los Ángeles Carrasco-Ruiz M1,2, García-Villamar V1,3, López-García K1,4, Sánchez-García O1,2, Pacheco P5,6, Cuevas E1, Martínez-Gómez M1,5, Castelán F1.
Cell biochemistry and function.Cell Biochem Funct.2015 Jun;33(4):188-95. doi: 10.1002/cbf.3102. Epub 2015 Apr 7.
Beyond its role in the conversion of androgens to estrogens, the expression of aromatase could influence on the estrogenic signalling in targeted tissues. Considering the well-defined biochemical and physiological differences between the pubococcygeus (Pcm) and bulbospongiosus (Bsm) muscles in femal
PMID 25850953

The male bulbospongiosus muscle and its relation to the external anal sphincter.

Peikert K1, Platzek I2, Bessède T3, May CA4.
The Journal of urology.J Urol.2015 Apr;193(4):1433-40. doi: 10.1016/j.juro.2014.10.050. Epub 2014 Oct 16.
PURPOSE: The bulbospongiosus muscle is part of the superficial muscular layer of the perineum and pelvic floor. Its morphology remains controversial in the literature. Therefore, we reinvestigated the fascial arrangement and fiber courses of the bulbospongiosus muscle and its topographical relation
PMID 25444962

Related Pictures

Bulbospongiosus muscle - Bing ATOMS › A.M.I Der Beckenboden - ein unterschätztes muskuläres Netzwerk | Fitness e!Motion Perineal region: Anatomy, definition, diagram | Kenhub

★リンクテーブル★

リンク元

「球海綿体筋」

Bulbospongiosus muscle
	Muscles of the female perineum. (Bulbocavernosus visible at upper right.)
	Muscles of male perineum. (Bulbocavernosus visible at upper left.)
Latin	musculus bulbospongiosus
Gray's	p.428
Origin	Median raphé
Artery	Perineal artery
Nerve	pudendal nerve
Actions	in males, empties the urethra; in females, clenches the vagina
	Anatomical terms of muscle

　　[★]

英: bulbospongiosus muscle (KH,M,N), bulbospongiosus (K,KL)
ラ: musculus bulbocavernosus, musculus bulbospongiosus

解剖

男性：陰茎球に付着
女性：陰核と会陰腱中心の間で前庭球の上を薄く覆う。大陰唇の皮下に存在する

機能 (K.41)

男性：射精時の律動的収縮
女性：膣口の絞扼

匿名

検索

案内

案内

musculus bulbospongiosus