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Reflexogenic areas for velopharyngeal closure in rabbits
Y Miyaoka1, M Inoue, K Shimada
1Department of Physiology, Niigata University School of Dentistry, Japan.
Dysphagia
|June 20, 1998
Summary
The posterior nasopharyngeal wall is most responsive for velopharyngeal closure in rabbits. This area may have more pressure receptors, influencing speech and swallowing mechanisms.
Area of Science:
- Physiology
- Neuroscience
- Speech Science
Background:
- Velopharyngeal closure is crucial for speech and swallowing.
- Understanding the neural control of velopharyngeal function is important.
Purpose of the Study:
- To identify specific pharyngeal areas responsive to pressure stimulation for velopharyngeal closure.
- To investigate the physiological basis of differential responsiveness in the pharynx.
Main Methods:
- Electromyography recorded diaphragmatic and superior pharyngeal constrictor activity in anesthetized rabbits.
- Pressure stimulation was applied to anterior and posterior nasopharyngeal walls and the posterior oropharyngeal wall.
- Stimulation parameters: 9.0 gf intensity and 0.43 sec duration.
Main Results:
- Velopharyngeal closure was elicited more frequently from the posterior nasopharyngeal wall compared to other tested areas.
- The posterior nasopharyngeal wall demonstrated higher responsiveness to pressure stimuli.
Conclusions:
- The posterior nasopharyngeal wall is a key area for triggering velopharyngeal closure.
- Higher density or lower threshold of pressure receptors in this region likely explains its heightened responsiveness.
- Findings have implications for understanding velopharyngeal motor control and potential therapeutic targets.