Mammalian motor units: physiological-histochemical correlation in three types in cat gastrocnemius.
The correlation among a variety of physiological properties and the histochemical characteristics of muscle fibers belonging to single motor units in a mixed mammalian muscle is directly demonstrated. The population of motor units making up the cat gastrocnemius was classified into three nonoverlapping groups on the basis of a combination of physiological parameters. The muscle fibers belonging to motor units of each physiological type exhibited a distinctive histochemical profile, such that the three basic histochemical "fiber types" exactly matched the three physiologically defined groups. Within each individual motor unit, the muscle fibers were histochemically uniform.
D000251:Adenosine Triphosphatases / Q000032:analysis; D000818:Animals; D002415:Cats; D004558:Electric Stimulation; D006003:Glycogen / Q000032:analysis; D006651:Histocytochemistry; D009046:Motor Neurons / Q000502:physiology*; D009119:Muscle Contraction; D009132:Muscles / Q000032:analysis / Q000201:enzymology / Q000294:innervation* / Q000502:physiology; D009243:NAD / Q000032:analysis; D010088:Oxidoreductases / Q000032:analysis; D013194:Staining and Labeling; D013385:Succinate Dehydrogenase / Q000032:analysis
D009243:NAD; D006003:Glycogen; D010088:Oxidoreductases; D013385:Succinate Dehydrogenase; D000251:Adenosine Triphosphatases