Innermost intercostal muscle
| Innermost intercostal muscle | |
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Innermost intercostal muscle (red), seen from back.
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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 |
| Dorlands /Elsevier |
m_22/12549384 |
| TA | A04.4.01.014 |
| FMA | 74086 |
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Anatomical terms of muscle
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The innermost intercostal muscle is a layer of intercostal muscles deep to the plane that contains the intercostal nerves and intercostal vessels and the internal intercostal muscles. These are divided into:
Innermost intercostal muscle (shown in red). Animation.
A cutout of the thoracic wall showing the three layers of intercostal muscle - from the left wall.
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