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Subcostal muscles
Last reviewed: 07.07.2025
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The subcostal muscles (mm. subcostales) are formed by muscle and tendon bundles in the lower part of the posterior section of the inner surface of the chest wall. They begin on the X-XII ribs near their angles, are directed upward and laterally, are thrown over one or two ribs and are attached to the inner surface of the overlying ribs.
Function of the subcostal muscles: they lower the ribs.
Innervation of the subcostal muscles: intercostal nerves (ThI-ThXI).
Blood supply to the subcostal muscles: posterior intercostal arteries.
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