Innermost intercostal muscle
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|Innermost intercostal muscle|
Innermost intercostal muscle (red), seen from back.
|Latin||musculus intercostalis intimus|
|Origin||Infero-posterior border of each rib (above)|
|Insertion||Supero-posterior border of the rib (below)|
|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.|
|Anatomical terms of muscle|
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:
- transversus thoracis anteriorly
- lateral muscle slips laterally (which cross a single intercostal space)
- subcostalis posteriorly (which often cross more than one intercostal space)
|Wikimedia Commons has media related to Innermost intercostal muscles.|
- 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."
- -301596595 at GPnotebook
- thoraxmuscles at The Anatomy Lesson by Wesley Norman (Georgetown University)
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