larynx 00-13-49

larynx 00-13-49 - PHONATORY SYSTEM the phonatory system is...

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PHONATORY SYSTEM the phonatory system is the source of voiced sound phonation is the generation of voiced sound phonation is accomplished with the larynx (voice box), which is attached to the top of the trachea, and is the outlet of the respiratory pump into the upper airway THE LARYNX is the structure at the entrance to the trachea that functions as a valve biologically and as the source of voice for speech it can close tightly, as when we lift a heavy object, to make the thorax rigid with compressed air – providing stability to the body during heavy muscular activity it can accomplish the explosive movements of a cough, expelling mucus and irritants at great velocity into the airway it can valve the air stream so as to produce finely controlled vibrations of two fleshy cushions called the vocal folds FUNCTIONS OF THE LARYNX BORROWED FOR SPEECH: the ability to open in order to produce about half of the consonants, the half that are voiceless sounds (these sounds are made with busts and hisses of noise) the ability to close (al the level of the vocal folds) just enough to vibrate when air pressure pushes against it – these vibrations produce voiced sounds, the tones that characterize vowels and semivowels particularly
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