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Velopharyngeal inadequacy (VPI) is a malfunction of a velopharyngeal mechanism. The velopharyngeal mechanism is responsible for directing the transmission of sound energy and air pressure in both the oral cavity and the nasal cavity. When this mechanism is impaired in some way, the valve does not fully close, and a condition known as 'velopharyngeal inadequacy' can develop. VPI can either be congenital or acquired later in life. ==Terminology== Different terms can be used to describe this phenomenon in addition to “velopharyngeal inadequacy”. These terms and definitions are as follows: *Velopharyngeal insufficiency: The inability of the velopharyngeal sphincter to sufficiently separate the nasal cavity from the oral cavity during speech. *Velopharyngeal incompetency: When the soft palate and the lateral/posterior pharyngeal walls fail to separate the oral cavity from the nasal cavity during speech. Although the definitions are similar, the etiologies correlated with each term differ slightly; however, in the field of medical professionals these terms are typically used interchangeably. Velopharyngeal inadequacy is the generic term most often used to describe the functionality of the velopharyngeal valve. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「velopharyngeal inadequacy」の詳細全文を読む スポンサード リンク
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