Intercostal muscle
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207981462
2008-04-24T22:59:23Z
Vina-iwbot
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robot Adding: [[zh:肋間肌]]
{{Infobox Muscle |
Name = {{PAGENAME}} |
Latin = |
GraySubject = 117 |
GrayPage = 403 |
Image = Gray411.png |
Caption = Deep muscles of the chest and front of the arm, with the boundaries of the [[axilla]]. |
Image2 = |
Caption2 = |
Origin = ribs 1-11 |
Insertion = ribs 2-12 |
Blood = [[intercostal arteries]] |
Nerve = [[intercostal nerves]] |
Action = |
Antagonist = |
MeshName = Intercostal+Muscles |
MeshNumber = A02.633.567.900.500 |
DorlandsPre = |
DorlandsSuf = |
}}
'''Intercostal muscles''' are several groups of [[muscle]]s that run between the [[ribs]], and help form and move the [[chest wall]].
There are three principal layers;
* the [[external intercostal muscles]], which aid in quiet and forced [[inhalation]]. They originate on ribs 1-11 and have their insertion on ribs 2-12. The external intercostals are responsible for the elevation of the ribs, and expanding the transverse dimensions of the [[thoracic cavity]].
Located around the the ribs
* the [[internal intercostal muscles]], which aid in forced [[expiration]] (quiet expiration is a passive process). They originate on ribs 1-11 and have their insertions on ribs 2-12. The internal intercostals are responsible for the depression of the ribs decreasing the transverse dimensions of the thoracic cavity.
* the [[innermost intercostal muscle]]
Both the external and internal muscles are innervated by the [[intercostal nerves]] (the [[ventral rami]] of [[thoracic spinal nerves]]), and are provided by the [[intercostal arteries]] and [[intercostal veins]]. Their fibers run in opposite directions.
==Other intercostal muscles==
Besides the [[scaleni]], which also move the chest wall and have a function in inhalation, other intercostal muscles are:
* [[Subcostal muscles]]
* [[Transversus thoracis]] muscle
== External links ==
* {{GPnotebook|-294977459}}
* {{SUNYAnatomyFigs|18|03|03}}
* [http://faculty.ucc.edu/biology-potter/Musculature/sld020.htm UCC]
{{Muscles of trunk}}
[[Category:Muscles of the trunk]]
{{muscle-stub}}
[[de:Musculus intercostalis]]
[[pl:Mięśnie międzyżebrowe]]
[[pt:Músculo intercostal]]
[[zh:肋間肌]]