Vocal Function
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Intercostals
  • These two sets of muscles serve opposite functions in breathing

External Intercostals
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  • Used primarily for inhalation
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  • When they contract, they pull the ribs up and out, causing the rib cage to expand, drawing air into the lungs

Internal Intercostals
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  • Used primarily for exhalation
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  • When they contract, they pull the ribs down and in, expelling air from the lungs
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  • Contraction of the internal intercostals causes the rib cage to contract.