Internal intercostal muscles
- Internal intercostal muscles
Muscle infobox
Name = Intercostales interni muscle
Latin = musculi intercostales interni
GraySubject = 117
GrayPage = 403
Caption = Deep muscles of the chest and front of the arm, with the boundaries of the axilla. (Intercostalis internus labeled at bottom left.)
Caption2 = Posterior surface of sternum and costal cartilages, showing Transversus thoracis. (Intercostalis internus visible at left.)
Origin = rib - inferior border
Insertion = rib - superior border
Action = hold ribs steady
Antagonist = Intercostales externi muscles
Blood = intercostal arteries
Nerve = intercostal nerves
DorlandsPre = m_22
DorlandsSuf = 12549376
The Intercostales interni (Internal intercostals) are eleven in number on either side. They commence anteriorly at the sternum, in the interspaces between the cartilages of the true ribs, and at the anterior extremities of the cartilages of the false ribs, and extend backward as far as the angles of the ribs, whence they are continued to the vertebral column by thin aponeuroses, the posterior intercostal membranes.
Each arises from the ridge on the inner surface of a rib, as well as from the corresponding costal cartilage, and is inserted into the upper border of the rib below.
Their fibers are also directed obliquely, but pass in a direction opposite to those of the Intercostales externi.
=Additional
External links
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* - "The Internal Intercostal Muscle"
* - "Transverse section of thorax."
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Wikimedia Foundation.
2010.
Look at other dictionaries:
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intercostal muscles internal — musculi intercostales interni … Medical dictionary
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