Quiet respirationForced inspirationPhonationEffort closureSwallowingVocal foldVocal foldsclosedVestibular foldVestibularfolds closedAry-epiglottic foldLaryngeal inletLaryngealinlet narrowedEpiglottis swingsdown to arytenoidsEpiglottis• Vocal folds    abducted   and rima glottidis   wide open• Vestibule open• Vocal folds    adducted and    stridulating as   air is forced    between them• Vestibule open• Vocal folds and    vestibular folds    adducted• Rima glottidis and   vestibule closedABCDE