The mucosal wave is the undulating motion of the mucous membrane (mucosa) that covers the vocal folds. During phonation, when air passes between the vocal folds, the vibratory motion of the vocal folds sets the mucosal wave in motion. This wave-like movement travels along the length of the vocal folds. The mucosal wave contributes to the complexity of vocal sound production, affecting the quality and timbre of the voice.
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