Document Detail

Length changes of intercostal muscles during respiration in the cat.
MedLine Citation:
PMID:  2616926     Owner:  NLM     Status:  MEDLINE    
Sonomicrometry was used to measure the length changes of intercostal muscles throughout the rib cage of anesthetized cats. The motor unit discharge in the vicinity of the length measurement was monitored with bipolar electrodes. The external intercostal muscles in the rostral spaces and the parasternals actively shortened during inspiration. The external intercostals in the caudal spaces, which were inactive, either shortened or lengthened passively due to the forces imposed on the lower rib cage by the contraction of the diaphragm. The length changes of external intercostals of the mid-thoracic spaces, which were recruited during inspiration, were variable. The internal intercostals were usually inactive in our preparation and therefore their length excursions passively followed those of the external intercostals. The information regarding the length changes is correlated with that previously gathered for the role of muscle spindles in the intercostal muscles. It is suggested that gamma motoneurons are recruited to prevent the muscle spindles from being unloaded when the intercostal muscle shortens and to increase the sensitivity of the receptors during the phase of the respiratory cycle when the muscle is active.
J J Greer; R B Stein
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Respiration physiology     Volume:  78     ISSN:  0034-5687     ISO Abbreviation:  Respir Physiol     Publication Date:  1989 Dec 
Date Detail:
Created Date:  1990-03-13     Completed Date:  1990-03-13     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0047142     Medline TA:  Respir Physiol     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  309-21     Citation Subset:  IM    
Department of Physiology, University of Alberta, Edmonton, Canada.
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MeSH Terms
Efferent Pathways / physiology
Intercostal Muscles / innervation,  physiology*
Muscle Denervation
Respiration / physiology*
Trachea / physiology

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