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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/08/06 01:12:50」(JST)

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The Coccygeus is a muscle of the pelvic floor, located posterior to levator ani and anterior to the sacrospinous ligament.

It is a triangular plane of muscular and tendinous fibers, arising by its apex from the spine of the ischium and sacrospinous ligament, and inserted by its base into the margin of the coccyx and into the side of the lowest piece of the sacrum.

In combination with the levator ani, it forms the pelvic diaphragm.

It assists the levator ani and piriformis in closing in the back part of the outlet of the pelvis.

References

^ Essential Clinical Anatomy. K.L. Moore & A.M. Agur. Lippincott, 2 ed. 2002. Page 217
^ Origin, insertion and nerve supply of the muscle at Loyola University Chicago Stritch School of Medicine
^ "uams.edu". Retrieved 2007-12-09.

External links

Anatomy photo:43:16-0103 at the SUNY Downstate Medical Center - "The Female Pelvis: Muscles of the Pelvic Diaphragm"
Cross section at UV pelvis/pelvis-e12-15
pelvis at The Anatomy Lesson by Wesley Norman (Georgetown University) (femalepelvicdiaphragm, malepelvicdiaphragm)
Coccyx pain, tailbone pain, coccydynia (Peer-reviewed medical chapter, available free online at eMedicine)

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

UpToDate Contents

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English Journal

Architectural design of the pelvic floor is consistent with muscle functional subspecialization.

Tuttle LJ, Nguyen OT, Cook MS, Alperin M, Shah SB, Ward SR, Lieber RL.Author information Department of Orthopaedic Surgery, University of California San Diego, San Diego, CA, USA.AbstractINTRODUCTION AND HYPOTHESIS: Skeletal muscle architecture is the strongest predictor of a muscle's functional capacity. The purpose of this study was to define the architectural properties of the deep muscles of the female pelvic floor (PFMs) to elucidate their structure-function relationships.
International urogynecology journal.Int Urogynecol J.2014 Feb;25(2):205-12. doi: 10.1007/s00192-013-2189-5. Epub 2013 Aug 1.
INTRODUCTION AND HYPOTHESIS: Skeletal muscle architecture is the strongest predictor of a muscle's functional capacity. The purpose of this study was to define the architectural properties of the deep muscles of the female pelvic floor (PFMs) to elucidate their structure-function relationships.METHO
PMID 23903821

Influence of developing ligaments on the muscles in contact with them: a study of the annular ligament of the radius and the sacrospinous ligament in mid-term human fetuses.

Hayashi S, Kim JH, Rodriguez-Vazquez JF, Murakami G, Fukuzawa Y, Asamoto K, Nakano T.Author information Medical Education Center, Aichi Medical University School of Medicine, Aichi, Japan. ; Department of Anatomy, Aichi Medical University School of Medicine, Aichi, Japan.AbstractThe supinator muscle originates from the annular ligament of the radius, and the muscle fibers and ligament take a similar winding course. Likewise, the coccygeus muscle and the sacrospinous ligament are attached together, and show a similar fiber orientation. During dissection of adult cadavers for our educational curriculum, we had the impression that these ligaments grow in combination with degeneration of parts of the muscles. In histological sections of 25 human fetuses at 10-32 weeks of gestation, we found that the proximal parts of the supinator muscle were embedded in collagenous tissue when the developing annular ligament of the radius joined the thick intermuscular connecting band extending between the extensor carpi radialis and anconeus muscles at 18-22 weeks of gestation, and the anterior parts of the coccygeus muscle were surrounded by collagenous tissue when the intramuscular tendon became the sacrospinous ligament at 28-32 weeks. Parts of these two muscles each seemed to provide a mold for the ligament, and finally became involved with it. This may be the first report to indicate that a growing ligament has potential to injure parts of the "mother muscle," and that this process may be involved in the initial development of the ligament.
Anatomy & cell biology.Anat Cell Biol.2013 Jun;46(2):149-56. doi: 10.5115/acb.2013.46.2.149. Epub 2013 Jun 30.
The supinator muscle originates from the annular ligament of the radius, and the muscle fibers and ligament take a similar winding course. Likewise, the coccygeus muscle and the sacrospinous ligament are attached together, and show a similar fiber orientation. During dissection of adult cadavers for
PMID 23869262

Alterations in pelvic floor muscles and pelvic organ support by pregnancy and vaginal delivery in squirrel monkeys.

Bracken JN, Reyes M, Gendron JM, Pierce LM, Runge VM, Kuehl TJ.Author information Department of Obstetrics, Scott and White Memorial Hospital and Clinic, 2401 South 31st Street, Temple, TX 76508, USA. jbracken@swmail.sw.orgAbstractINTRODUCTION AND HYPOTHESIS: The objective of this study was to measure the effects of pregnancy and parturition on pelvic floor muscles and pelvic organ support.
International urogynecology journal.Int Urogynecol J.2011 Sep;22(9):1109-16. doi: 10.1007/s00192-011-1443-y. Epub 2011 May 13.
INTRODUCTION AND HYPOTHESIS: The objective of this study was to measure the effects of pregnancy and parturition on pelvic floor muscles and pelvic organ support.METHODS: Levator ani, obturator internus, and coccygeus (COC) muscle volumes and contrast uptake were assessed by MRI of seven females pri
PMID 21567260

「尾骨筋」

Coccygeus muscle
	Left Levator ani from within.
Latin	musculus coccygeus
Gray's	p.424
Origin	Sacrospinous ligament and ischial spine
Insertion	Lateral margin of coccyx and related border of sacrum
Nerve	sacral nerves: S4, S5 or S3-S4
Actions	pulls coccyx forward after defecation, closing in the back part of the outlet of the pelvis
	Anatomical terms of muscle

　　[★]

英: coccygeus muscle (M,N,K)
ラ: musculus coccygeus
関: 骨盤隔膜、肛門挙筋

肛門挙筋の後方にある薄い筋。坐骨棘から起こり、内方に扇状に広がって尾骨につく(KL.464)

起始

坐骨棘

停止

尾骨

神経

機能

[Moore217-1] Essential Clinical Anatomy. K.L. Moore & A.M. Agur. Lippincott, 2 ed. 2002. Page 217

[2] Origin, insertion and nerve supply of the muscle at Loyola University Chicago Stritch School of Medicine

[title-3] "uams.edu". Retrieved 2007-12-09.

匿名

検索

案内

案内

musculus coccygeus