Internal intercostal muscles
Internal intercostal muscles , mm. Intercostales interni, start from the upper edges of the ribs, go obliquely upward and anteriorly and attach to the lower edges of the overlying ribs, inside the rib groove. They are not in the back of the intercostal space, behind the corners of the ribs. Here there is an internal intercostal membrane, membrana intercostalis interna.
Sources of innervation and blood supply are the same as external intercostal muscles.
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