What are intercostal muscles?

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  1. #intercostal
  2. #these
  3. #mainly
  4. #expand
  5. #breathing
  6. #aspect
  7. #facilitate
  8. #involved
  9. #mechanical
  10. #shrink
  11. #between
  12. #cavity
  13. #several
  14. #chest
  15. #groups
  16. #muscles