Disorders of Deglutition

to recall certain normal processes involved in this function. In the laryngo-pharynx the most important mechanism is the closure of the larynx. This is effected by the apposition and tilting forward of the arytenoids and the apposition of the aryepiglottic folds, while a raising of the larynx brings the arytenoids with their cornicula into contact with the cushion of the epiglottis. The contractions in sequence of the middle and inferior constrictors of the pharynx cause the bolus to glide in turn over the posterior surfaces of the epiglottis and the arytenoids and to enter the hypo-pharynx. According to Chevalier Jackson the bolus is split into