define The external intercostal muscles tutorvista
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The intercostal muscles are a group of muscles found between the ribs which are responsible for helping form and maintain the cavity produced by the ribs, and assisting with expansion and contraction during breathing. The intercostal muscles consist of 11 muscle trios in humans, one innermost intercostal muscle towards the chest cavity, one between the ribs, and one external muscle between each of the 12 ribs. The first and last ribs only have intercostal muscles on one side
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