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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2013/10/19 13:20:52」(JST)

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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.

Action[edit]

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.

Location[edit]

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[edit]

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.

Gallery[edit]

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[edit]

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

External links[edit]

LUC bulb
-838467507 at GPnotebook
SUNY Labs 41:11-0102—"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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4. 膣後壁欠損の外科的マネージメント surgical management of posterior vaginal defects
5. 肛門直腸瘻の外科的マネージメント operative management of anorectal fistulas

English Journal

Effect of botulinum-a toxin injection into bulbospongiosus muscle on ejaculation latency in male rats.

Serefoglu EC1, Hawley WR, Lasker GF, Grissom EM, Mandava SH, Sikka SC, Dohanich GP, Hellstrom WJ.
The journal of sexual medicine.J Sex Med.2014 Jul;11(7):1657-63. doi: 10.1111/jsm.12553. Epub 2014 Apr 29.
INTRODUCTION: Premature ejaculation (PE) is the most common male sexual dysfunction. A variety of pharmacotherapeutic strategies have been employed to treat men suffering with lifelong PE. However, there are currently no pharmaceuticals approved by the U.S. Food and Drug Administration specifically
PMID 24774776

Distribution of caveolin in the muscle spindles of human skeletal muscle.

Peikert K1, Kasper M, May CA.
Journal of anatomy.J Anat.2014 Jun;224(6):681-7. doi: 10.1111/joa.12173. Epub 2014 Mar 25.
The aim of the present study was to demonstrate the location of the different members of the caveolin (cav) family in human muscle spindles. Twenty spindles of three human muscles (vastus medialis, ischiocavernosus, bulbospongiosus) from 12 cadavers were immunohistochemically stained for cav-1, cav-
PMID 24660982

Dracaena arborea extracts delay the pro-ejaculatory effect of dopamine and oxytocin in spinal male rats.

Watcho P1, Modeste WN1, Albert K1, Carro-Juarez M2.
International journal of impotence research.Int J Impot Res.2014 May 1. doi: 10.1038/ijir.2014.13. [Epub ahead of print]
Dracaena arborea is a medicinal plant with ethnopharmacological aphrodisiac reputation. In the present study, the effect of an intravenous administration of aqueous and ethanolic extracts from the dried roots of this plant on the ejaculatory pattern of spinal cord-transected and urethane-anaesthetiz
PMID 24784892

Japanese Journal

99-03-04 腹圧性尿失禁の予防および治療のための骨盤底筋群強化訓練システムの開発(平成11年度プロジェクト研究報告(保健学部・保健学研究科),研究助成金による成果紹介)

嶋津秀昭,小林博子,谷口珠実,東原英二,村田明弘,土屋有利子,飯田加奈恵
杏林医学会雑誌 32(4), 454-455, 2001-12-30
NAID 110007376143

イヌの陰茎の血管系 : 樹脂鋳型法による観察

二宮博義,中村経紀,新妻勲夫,土屋新男
日本獣医学雑誌 51(4), 765-773, 1989-08-15
イヌの陰茎の血管系をアクリル樹脂鋳型法で立体的に観察した. さらに, 鋳型標本で特微的な部位について, 連続切片により組織学的観察も行った. 注入樹脂の刺激作用により, 坐骨海綿体筋と球海綿体筋が収縮し, 陰茎脚と尿道球が圧縮されており, これらの筋が勃起時に海綿体内圧を維持するためのポンプ効果を持つことが示唆された. さらに, 尿道球の遠部位が外肝門括約筋の圧縮を受けており, 尿道海綿体中の血液 …
NAID 110003918047

Related Pictures

Bulbospongiosus muscle - Bing superficial perineal space, bulbospongiosus, ischiocavernosus, transverse perineal muscle

★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	subject #120 428
Origin	Median raphé
Insertion
Artery	Perineal artery
Nerve	pudendal nerve
Actions	in males, empties the urethra; in females, clenches the vagina

　　[★]

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

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	subject #120 428
Origin	Median raphé
Insertion
Artery	Perineal artery
Nerve	pudendal nerve
Actions	in males, empties the urethra; in females, clenches the vagina

匿名

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案内

案内

bulbospongiosus