. Lectures upon the mechanism of speech . d, alone is employed in the production of speech. Observethe breathing of a person engaged in conversation at a time whenhe is unconscious of your observation. You will find that manywords are articulated between each inspiration. The time takenfor inspiration is instantaneous, whereas the duration of the expira-tion is very long. The breath comes in quickly, and goes outslowly. This means that the trap doors in the roof of the thoraciccavity are opened widely during inspiration, and closed so tightlyduring the aft of speech, that only a
. Lectures upon the mechanism of speech . d, alone is employed in the production of speech. Observethe breathing of a person engaged in conversation at a time whenhe is unconscious of your observation. You will find that manywords are articulated between each inspiration. The time takenfor inspiration is instantaneous, whereas the duration of the expira-tion is very long. The breath comes in quickly, and goes outslowly. This means that the trap doors in the roof of the thoraciccavity are opened widely during inspiration, and closed so tightlyduring the aft of speech, that only a fine stream of air can escapefrom the thorax. The prime requisite for speech is a store of com-pressed air, which can be let out little by little, as wanted. It isobvious that the air would escape with a gush unless trap doors already alluded to. constitute the chief means bywhich a too rapid escape of air is prevented. These trap doors areknown as the vocal cords, and they are contained in the larynx. THE LARYNX. Fig. 12
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