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E-book
Author Mittal, Ravinder K.

Title Motor function of the pharynx, esophagus, and its sphincters / Ravinder Mittal
Published [San Rafael, Calif.] : Morgan & Claypool Life Sciences, [2011]
©2011
Online access available from:
Colloquium Digital Library of Life Sciences    View Resource Record  

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Description 1 online resource (viii, 76 pages) : illustrations
Series Integrated systems physiology, 2154-5626 ; #16
Colloquium series on integrated systems physiology ; #16. 2154-5626
Contents Introduction -- Central program generator and brain stem -- Pharynx, anatomy, neural innervation, and motor pattern -- Upper esophageal sphincter -- Neuromuscular anatomy of esophagus and lower esophageal sphincter -- Extrinsic innervation: parasympathetic and sympathetic -- Sympathetic/spinal/splanchnic nervous system -- Intrinsic innervations of the LES and esophagus -- Interstitial cells of Cajal -- Recording techniques -- Motor patterns of the esophagus, aboral and oral transport -- Circular muscle contraction -- Deglutitive inhibition and muscle refractoriness -- Peristalsis in the circular and longitudinal muscles of the esophagus -- Neural and myogenic mechanism of peristalsis -- Central mechanism of peristalsis, cortical and brain stem control -- Peripheral mechanisms of peristalsis -- Central versus peripheral mechanism of deglutitive inhibition -- Neural control of longitudinal muscle contraction -- Modulation of primary and secondary peristalsis -- Neural control of lower esophageal sphincter and crural diaphragm -- Lower esophageal sphincter -- Swallow-induced LES relaxation -- Crural diaphragm contribution to EGJ and neural control -- Transient LES relaxation and pharmacological inhibition -- Compliance of the EGJ -- References
Summary Deglutition or a swallow begins as a voluntary act in the oral cavity but proceeds autonomously in the pharynx and esophagus. Bilateral sequenced activation and inhibition of more than 25 pairs of muscles of mouth, pharynx, larynx, and esophagus is required during a swallow. A single swallow elicits peristalsis in the pharynx and esophagus along with relaxation of upper and lower esophageal sphincters. Multiple swallows, at closely spaced time intervals, demonstrate deglutitive inhibition; sphincters remain relaxed during the entire period, but only the last swallow elicits peristalsis. Laryngeal inlet closure or airway protection is very important during swallow. Upper part of the esophagus that includes upper esophageal sphincter is composed of skeletal muscles, middle esophagus is composed of a mixture of skeletal and smooth muscles, and lower esophagus, including lower esophageal sphincter, is composed of smooth muscles. Peristalsis progresses in seamless fashion, despite separate control mechanism, from the skeletal to smooth muscle esophagus. The esophagus's circular and longitudinal muscle layers contract synchronously during peristalsis. Sphincters maintain continuous tone; neuromuscular mechanisms for tonic closure in the upper and lower esophageal sphincters are different. Lower esophageal sphincter transient relaxation, belching mechanism, regurgitation, vomiting, and reflux are mediated via the brain stem
Analysis Achalasia esophagus
Circular and longitudinal muscle coordination
Deglutition center
Eneteric nervous system
Esophageal peristalsis
High resolution manometry
Lower esophageal sphincter
Neural control of peristalsis
Swallow program generator
Transient sphincter relaxation
Upper esophageal sphincter
Notes Title from PDF t.p. (viewed Aug. 17, 2011)
Bibliography Includes bibliographical references
Notes Issued also in print
Subject Deglutition.
Esophagogastric junction.
Esophagus.
Pharyngoesophageal sphincter.
Pharynx.
Esophagus -- physiology.
Deglutition -- physiology.
Peristalsis -- physiology.
Pharynx -- physiology.
Form Electronic book
ISBN 1615043330 (paperback)
1615043349 (ebook)
9781615043330 (paperback)
9781615043347 (ebook)