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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/02/07 14:09:29」(JST)

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The transversus thoracis muscle (/trænzˈvɛrsəs θəˈreɪsᵻs/) lies internal to the thoracic cage, anteriorly. It is a thin plane of muscular and tendinous fibers, situated upon the inner surface of the front wall of the chest. It is in the same layer as the subcostal muscles and the innermost intercostal muscles.

It arises on either side from the lower third of the posterior surface of the body of the sternum, from the posterior surface of the xiphoid process, and from the sternal ends of the costal cartilages of the lower three or four true ribs.

Its fibers diverge upward and lateralward, to be inserted by slips into the lower borders and inner surfaces of the costal cartilages of the second, third, fourth, fifth, and sixth ribs.

The lowest fibers of this muscle are horizontal in their direction, and are continuous with those of the transversus abdominis; the intermediate fibers are oblique, while the highest are almost vertical.

This muscle varies in its attachments, not only in different subjects, but on opposite sides of the same subject.

The muscle is supplied by the anterior rami of the thoracic spinal nerves (intercostal nerves).

Function

It is almost completely without function, but it separates the thoracic cage from the parietal pleura. It depresses the ribs.

Contraction of this muscle aids in exertional expiration by decreasing the transverse diameter of the thoracic cage.

Additional images

Transverse section of thorax, showing relations of pulmonary artery.
Diagram of the course and branches of a typical intercostal nerve.

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

External links

Anatomy photo:18:05-0104 at the SUNY Downstate Medical Center - "Thoracic Wall: Removal of Intercostal Muscles"
thoraxmuscles at The Anatomy Lesson by Wesley Norman (Georgetown University)

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English Journal

Internal Oblique and Transversus Abdominis Muscle Fatigue Induced by Slumped Sitting Posture after 1 Hour of Sitting in Office Workers.

Waongenngarm P1, Rajaratnam BS2, Janwantanakul P1.
Safety and health at work.Saf Health Work.2016 Mar;7(1):49-54. doi: 10.1016/j.shaw.2015.08.001. Epub 2015 Aug 21.
BACKGROUND: Prolonged sitting leads to low back discomfort and lumbopelvic muscle fatigue. This study examined the characteristics of body perceived discomfort and trunk muscle fatigue during 1 hour of sitting in three postures in office workers.METHODS: Thirty workers sat for 1 hour in one of three
PMID 27014491

Perceived body discomfort and trunk muscle activity in three prolonged sitting postures.

Waongenngarm P1, Rajaratnam BS2, Janwantanakul P1.
Journal of physical therapy science.J Phys Ther Sci.2015 Jul;27(7):2183-7. doi: 10.1589/jpts.27.2183. Epub 2015 Jul 22.
[Purpose] This study aimed to investigate the perceived discomfort and trunk muscle activity in three different 1-hour sitting postures. [Subjects] A repeated-measures design study was conducted on 10 healthy subjects. [Methods] Each subject sat for an hour in three sitting postures (i.e., upright,
PMID 26311951

Development of the rectus abdominis and its sheath in the human fetus.

Yang JD1, Hwang HP, Kim JH, Rodríguez-Vázquez JF, Abe S, Murakami G, Cho BH.
Yonsei medical journal.Yonsei Med J.2012 Sep;53(5):1028-35. doi: 10.3349/ymj.2012.53.5.1028.
PURPOSE: Although the rectus abdominis and its sheath are well known structures, their development in the human fetus is poorly understood.MATERIALS AND METHODS: We examined rectus abdominis and sheath development in semiserial horizontal sections of 18 fetuses at 5-9 weeks of gestation.RESULTS: Rec
PMID 22869489

Japanese Journal

STENOSIS OF THE INTERNAL THORACIC ARTERY GRAFT SKELETONIZED USING ULTRASONIC SCALPEL

深田義夫,西村哲也,市川洋一
医療 57(3), 181-185, 2003
… In E-group the dissection of the ITA using US was begun at the fascia of transversus thoracis muscle, but in L-group at the proxi mal portion, where ITA was surrounded by fat tissue and the hard fascia was dissected by mosquito clamp and opened by low current electrocautery far from ITA, Angiography was performed 3 weeks after the operation, The frequency of graft stenosis was reduced markedly from 20% in E-group to 0% in L-group. …
NAID 130004107715

ホルスタイン種およびF1(黒毛和種×ホルスタイン種)去勢牛の肥育過程における筋肉内脂肪含量の変化

山谷洋二,三谷克之輔,並河澄
日本畜産学会報 59(7), 619-627, 1988
… rectus thoracis. … transversus abdominis, M. … rectus thoracis and M. …
NAID 130000751711

The M.transversus thoracis in man and monkey

Satoh Jun-ichiro
Okajimas folia anatomica japonica 48(2・3), 103-137, 1971-08
NAID 40018677800

「胸横筋」

Transversus thoracis muscle
	Posterior surface of sternum and costal cartilages, showing transversus thoracis.
Details
Origin	Costal cartilages of last 3-4 true ribs, body of sternum and xiphoid process
Insertion	Ribs/costal cartilages 2-6
Artery	Intercostal arteries
Nerve	Intercostal nerves
Actions	Depresses ribs
Identifiers
Latin	Musculus transversus thoracis
Dorlands; /Elsevier	m_22/12551274
TA	A04.4.01.016
FMA	9760
	Anatomical terms of muscle [edit on Wikidata]

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英: transversus thoracis (K)

呼気の補助：第2～6肋骨を下制 (K.29)

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案内

案内

transversus thoracis