iphy 3430 1-27-11

iphy 3430 1-27-11 - 1/19/11 IPHY 3430 1-27-11 Control of...

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1/19/11 1 IPHY 3430 1-27-11 Control of saliva secretion Pressure and chemoreceptors in mouth--> and/or input from cerebral cortex (thoughts, smell, sight, sound)---> Salivary center in Medulla PNS Salivary glands SNS output from other centers (a. diminish blood supply, b) change composition Swallowing 1. Voluntary stage--tongue moves bolus back to back of tongue 2. Involuntary stage-- pressure receptors on tongue send signal to swallowing centers in pons and medulla--> Output of swallowing centers: 1. motor output -- a) tongue moves up to hard palate to prevent food return to mouth b) uvula elevated to seal off nasal passages
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2 c.Larnyx is elevated and laryngeal muscles contract vocal folds to seal off trachea. d. Epiglottis tilted over glottis helps seal off trachea. e. After all these motor outputs occur, pharyngeal muscles contract to force bolus into esophagus. 2. Swallowing center inhibits inhalation stimulus from medulla respiratory centers Accomplishments in the mouth 1. Increase surface area of food
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This note was uploaded on 02/23/2011 for the course IPHY 3430 taught by Professor Lynch,robe during the Spring '08 term at Colorado.

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iphy 3430 1-27-11 - 1/19/11 IPHY 3430 1-27-11 Control of...

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