Intercostal muscle 486445 207981462 2008-04-24T22:59:23Z Vina-iwbot 727408 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]]