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Source: National Institute of Health, National Institute on Deafness and Other Communication Disorders. www.nidcd.nih.gov
Speech is normally produced through a series of muscle movements involving
Respiration - the breathing
Phonation - the voicing
Articulation - throat, palate, tongue, lips, and teeth
Before speaking, an individual takes a breath and the vocal folds (or vocal cords), which are two bands of muscular tissue located in the voice box directly above the trachea or windpipe, must come together. The air that is held in the lungs is gradually released, passing through the gently closed vocal folds thus causing vibration and producing the voice. The sound of the voice is passed through the throat and is directed into the mouth for most speech sounds, or into the nose for nasal sounds such as "m," "n" and "ng." The palate, tongue, jaw and lips move in precise ways to modify the sounds in order to make speech sounds.
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