Innermost intercostal muscle
| Innermost intercostal muscle | |
|---|---|
 Innermost intercostal muscle (red), seen from back. | |
| 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 |
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| TH | {{#property:P1694}} |
| TE | {{#property:P1693}} |
| FMA | {{#property:P1402}} |
| Anatomical terms of muscle [[[d:Lua error in Module:Wikidata at line 865: attempt to index field 'wikibase' (a nil value).|edit on Wikidata]]] | |
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]
Additional images
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Innermost intercostal muscle (shown in red). Animation.
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A cutout of the thoracic wall showing the three layers of intercostal muscle - from the left wall.
References
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External links
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- Anatomy photo:18:04-0103 at the SUNY Downstate Medical Center - "Thoracic Wall: The Intercostal Nerve and Vessels"
- Anatomy figure: 18:03-04 at Human Anatomy Online, SUNY Downstate Medical Center - "Transverse section of thorax."
- thoraxmuscles at The Anatomy Lesson by Wesley Norman (Georgetown University)
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