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How does the soft palate control whether air passes through the nose during speech?
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speech
Speech is the faculty of producing articulated sounds, which, when blended together, form language.
The soft palate, also known as the velum, acts as a flexible muscular flap that regulates airflow between the oral and nasal cavities during speech production.12
Its position determines whether air is directed through the nose or restricted to the mouth:
- Raised Position: When the soft palate is elevated and pressed against the posterior pharyngeal wall, it creates a "velic closure." This blocks off the nasal tract, preventing air from escaping through the nose. This action is necessary to form oral stops (such as the consonants in pie or tie), where air pressure builds up in the mouth before being released.132
- Lowered Position: When the soft palate is lowered, the nasal tract remains open, allowing air to pass through the nose. This position is used to produce nasal stops (such as the sounds at the beginning of my or nigh) and nasalized vowels.13
By adjusting this muscular flap, the body effectively manages the airstream to create the distinct acoustic properties required for various human speech sounds.12