Innermost intercostal muscle
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The innermost intercostal muscle is a layer of intercostal muscles.[1] It may also be called the intima of the internal intercostal muscles.[2] It is the deepest muscular layer of the thorax,[3] with muscle fibres running vertically (in parallel with the internal intercostal muscles).[2] It is present only in the middle of each intercostal space, and often not present higher up the rib cage.[3] It lies deep to the plane that contains the intercostal nerves and intercostal vessels, and the internal intercostal muscles.[3][4] The diaphragm is continuous with the innermost intercostal muscle.[5]
Quick Facts Details, Origin ...
Innermost intercostal muscle | |
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Details | |
Origin | Infero-posterior border of each rib (above) |
Insertion | Supero-posterior border of the rib (below) |
Artery | Intercostal arteries |
Nerve | Intercostal nerves |
Actions | Through adduction of upper ribs to the lower ribs the muscles narrow intercostal slits and diminish thorax volume, therefore the muscles represent expiratory muscles. |
Identifiers | |
Latin | musculus intercostalis intimus |
TA98 | A04.4.01.014 |
TA2 | 2313 |
FMA | 74086 |
Anatomical terms of muscle |
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