Document Detail

Distribution of fiber types in locomotory muscles of dogs.
MedLine Citation:
PMID:  6460435     Owner:  NLM     Status:  MEDLINE    
The distribution of Type I and Type II fibers, as determined from histochemical estimation of myofibrillar ATPase activity, was studied within and among the locomotory muscles of the forelimb, trunk, and hindlimb of three mongrel dogs. All Type II fibers had high oxidative capacities as estimated from the histochemical assay for reduced nicotinamide adenine dinucleotide tetrazolium reductase, so they were not further divided into subpopulations. Furthermore, Type I and Type II fibers had similar oxidative potentials as indicated by both histochemistry and biochemistry. Type I fiber populations ranged between 14% and 100% in the muscles sampled. The highest percentages of Type I fibers were found in deep muscles of physiological extensor groups in the arm and thigh that serve to resist gravity (antigravity muscles) when the dog is in the quadrupedal standing position. More superficial muscles in these same groups had fewer Type I fibers. The patterns of Type I fiber distribution among muscles in the antigravity groups of the forearm and leg were the opposite of those in the arm and thigh, with the more superficial muscles of the distal limb segments having more Type I fibers than the deeper muscles. In all limb segments, muscle groups that do not serve to resist gravity did not show as much intermuscular variation. Type I fiber populations in these muscles did not exceed 50%. A stratification of fiber types also existed within muscles, both in extensor and flexor groups, with the deeper portions of the muscles having more Type I fibers than the more superficial portions.
R B Armstrong; C W Saubert; H J Seeherman; C R Taylor
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The American journal of anatomy     Volume:  163     ISSN:  0002-9106     ISO Abbreviation:  Am. J. Anat.     Publication Date:  1982 Jan 
Date Detail:
Created Date:  1982-04-20     Completed Date:  1982-04-20     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0376312     Medline TA:  Am J Anat     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  87-98     Citation Subset:  IM    
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MeSH Terms
Adenosine Triphosphatases / metabolism
Muscles / anatomy & histology*,  enzymology
NADH Tetrazolium Reductase / metabolism
Organ Size
Phosphofructokinase-1 / metabolism
Succinate Dehydrogenase / metabolism
Grant Support
Reg. No./Substance:
EC Dehydrogenase; EC 1.6.-/NADH Tetrazolium Reductase; EC; EC 3.6.1.-/Adenosine Triphosphatases

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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