Format

Send to:

Choose Destination

Links from Books

Motor function of the pharynx, esophagus, and its sphincters

Author(s):
Mittal, Ravinder K
Title(s):
Motor function of the pharynx, esophagus, and its sphincters [electronic resource] / Ravinder Mittal.
Series:
Integrated systems physiology, ; #16 ISSN 2154-5626
Country of Publication:
United States
Publisher:
[San Rafael, Calif.] : Morgan & Claypool Life Sciences, c2011.
Description:
1 online resource (viii, 76 p.) : ill.
Language:
English
ISBN:
9781615043330 (pbk.)
9781615043347 (ebook)
Electronic Links:
http://www.ncbi.nlm.nih.gov/books/NBK54283
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.
MeSH:
Deglutition/physiology
Esophagus/physiology*
Peristalsis/physiology
Pharynx/physiology
Notes:
Title from PDF t.p. (viewed Aug. 17, 2011).
Includes bibliographical references.
Issued also in print.
NLM ID:
101563672 [Electronic Resource]

Supplemental Content

Loading ...
Support Center