Articulatory Physiology & Swallowing

Articulatory Physiology & Swallowing - Swallowing &...

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Chapter 7 Swallowing & Articulatory Physiology
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Chapter 7 part I Physiology of Swallowing 
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 Mastication and Deglutition Mastication Chewing process Preparing food for swallowing    Deglutition  Swallowing the food Two processes require integration of musculature,  laryngeal adjustments and respiratory control Lingual
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Neonatal Swallowing The newborn gains nutrition through rooting reflex Infant responds to tactile stimulation of lips or cheek  Infant turns toward stimulus and opens mouth Sucking reflex allows infant to receive food from mother’s  breast Velum of infant “locks” into space between epiglottis  and tongue Action seals off infant’s airway Bolus (ball of liquid) cannot enter respiratory passageway Infant can breathe while swallowing   
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Swallow Pattern of Neonate
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Infant’s Oral-Pharyngeal Structures  Differ from adult structures Oral cavity is smaller Larynx elevated at birth Velum is relatively larger Hyoid elevated and relatively forward No dentition in neonate
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Sucking and Swallowing in Neonate
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Stages of Mastication and Deglutition  (Adults) Oral preparatory stage (mastication) Oral stage (propulsion of bolus) Pharyngeal stage (pharyngeal swallow) Esophageal stage (esophageal transit) 
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Stages of Deglutition
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   Oral Preparatory Stage (Mastication) Food prepared for swallowing  Food kept in mouth by sealing of lips Food ground up by lingual muscles and muscles of  mastication Food mixed with saliva to form a bolus in  preparation for swallowing                                                                         
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Oral Stage Bolus pushed back toward the oropharynx by the  tongue Tongue Base retraction Velum closes off nasal cavity Muscles involved in oral stage Mandibular muscles Tongue muscles                                                          
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Stages of Deglutition
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Pharyngeal Stage Bolus propelled through pharynx to relaxed  esophageal sphincter which receives bolus Begins when bolus reaches faucial pillars Swallow is “triggered” Swallow trigger may occur at level of valleculae in normal,  older adults
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Pharyngeal Stage (Cont’d) Three levels of protection for vocal folds Vocal folds adduct Ventricular folds constrict Epiglottic retroflection Cricopharyngeus relaxes Epiglottic retroflection and CP opening occur due to 
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This document was uploaded on 10/31/2011 for the course COMD 501 at South Carolina.

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Articulatory Physiology & Swallowing - Swallowing &...

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