Innermost intercostal 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.
| 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 |
| TA | A04.4.01.014 |
| FMA | 74086 |
| Anatomical terms of muscle | |
Additional images
Innermost intercostal muscle (shown in red). Animation.
A cutout of the thoracic wall showing the three layers of intercostal muscle - from the left wall.
External links
 |
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."
- thoraxmuscles at The Anatomy Lesson by Wesley Norman (Georgetown University)
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