Communication Sciences and Disorders 4411A/B Lecture Notes - Lecture 16: Esophagus, Aspiration Pneumonia, Dysphagia
20 Nov 2018
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Deglutition: neuromuscular act of moving substance from mouth into throat, highly stereotyped motor behaviour, why do we swallow, maintenance, remove natural buildup of saliva in oral cavity. Ingestion: consume liquids and foods, protection, protect respiratory system from entry of foreign material, upper aerodigestive tract (uadt) In adults, upper respiratory and digestive paths are crossed. Pre-stage: oral prepatory: purpose to prepare substance to be swallowed, begins when food/liquid enters mouth, chewing is a part of pre-stage not oral phase. Includes containing material in oral cavity & preparing food/liquid into cohesive ball or bolus: oral phase, purpose to move bolus to rear of oral cavity until swallow reflex is triggered (in pharyngeal phase) Involves tongue and cheek muscles: pharyngeal phase, purpose to propel bolus through pharynx to entrance to esophagus, starts when swallow reflex (involuntary) is triggered, velum raises, pharynx contracts & squeezes, upper esophageal sphincter opens.
