What is usually not visible upon endoscopic laryngeal examination is our vocal folds vibration at high rates. The fundamental frequency is highest amongst neaonates, infants, and children followed by adult females and males. The phenomena of mucosal waves is caused by mucosal cover and superficial lamina propria propagated from below to upward direction. On videostroboscopy we can see mucosal waves as are more pronounced at low frequency. At high pitch the vocal fold lengthens and become more tense along sagittal axis. In this video we can see the comparison of glottic appearance at various pitch intensity by using two diagnostic techniques while the patient is phonating vowel "e".
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