Innermost intercostal muscle

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Innermost intercostal muscle
Innermost intercostal muscles back.png
Innermost intercostal muscle (red), seen from back.
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.
Latin musculus intercostalis intimus
TA A04.4.01.014
FMA 74086
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:

  1. transversus thoracis anteriorly
  2. lateral muscle slips laterally (which cross a single intercostal space)
  3. subcostalis posteriorly (which often cross more than one intercostal space)

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