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|Deep muscles of the chest and front of the arm, with the boundaries of the axilla.|
|Gray's||subject #117 403|
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 (=ventral rami of thoracic spinal nerves), and are provided by the intercostal arteries and intercostal veins. Their fibers run in opposite directions.
Other intercostal musclesEdit
Besides the scaleni, who also move the chest wall and have a function in inhalation, other intercostal muscles are:
- pl:Mięśnie międzyżebrowe
- pt:Músculo intercostal
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