Innermost intercostal muscle

Innermost intercostal muscle
Innermost intercostal muscle
Latin musculus intercostalis intimus
Origin Upper border of a rib
Insertion    Inferior border of the rib above
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.

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)

External links

v · List of muscles of thorax and back (TA A04.3–4, GA 4.397)
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