LING 1P93 Lecture Notes - Lecture 8: Epiglottis, Cerebral Palsy, Laryngectomy
30 May 2016
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Terminology: swallowing = deglutition, chewing = mastication, bolus food or liquid material formed into a rounded mass , swallowing disorder = dysphagia. Liquid bolus: lips close to form seal, sides of tongue elevate to form and contain bolus, cheek muscles tense to contain bolus, soft palate lowers to prevent premature spillage into pharynx. Semi-solid and solid bolus: additionally, muscles that control lower jaw allow rotary chewing movements, saliva mixed with food material to form bolus. Lip, tongue, and soft palate seals must be maintained. Cheek muscles pressure assists in transporting bolus backward. Tongue scrapes along hard palate from front to back propels bolus backwards faucial arches/pillars. Soft palate elevates -> vocal folds close tightly; larynx and moves forward (respiration stops (apneic moment)) -> contraction of pharyngeal constrictor muscles stasis when food/liquid does not fully vacate the throat after swallowing: valleculae, pyriform sinus. Ues opens (ues = upper esophageal sphincter) - >
