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Reference.org
Intercostal muscles
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<p>The intercostal muscles comprise many different groups of <a href="/facts/Muscle/dmxrL8pH">muscles</a> that run between the <a href="/facts/Ribs/KzXLlujq">ribs</a>, and help form and move the <a href="/facts/Chest_wall/Eg89Q7zl">chest wall</a>. The intercostal muscles are mainly involved in the mechanical aspect of <a href="/facts/Breathing/92Wov2gk">breathing</a> by helping expand and shrink the size of the <a href="/facts/Chest_cavity/4N5W74rF">chest cavity</a>. </p>