Intercostal muscle
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| Intercostal muscle | |
|---|---|
 | |
| Deep muscles of the chest and front of the arm, with the boundaries of the axilla. | |
| Gray's | subject #117 403 |
| Origin | ribs 1-11 |
| Insertion | ribs 2-12 |
| Artery: | intercostal arteries |
| Nerve: | intercostal nerves |
| Action: | |
| MeSH | Intercostal+Muscles |
Overview
Intercostal muscles are several groups of muscles 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:
External links
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Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
