title: Semitendinosus muscle development in fetally decapitated pigs.
abstract: The effect of decapitation on semitendinosus muscle growth and development was studied in the fetal pig. Pig fetuses were decapitated at 45 d of gestation and histochemical and biochemical analyses conducted at 110 d of gestation. Decapitation prevented or delayed the conversion of secondary fibers from Type II to Type I histochemistry as is characteristic of the normal semitendinosus. Morphological analyses indicated either a prolonged stage of secondary myofiber formation or an inhibition of secondary myofiber hypertrophy in muscle from decapitated fetuses. Biochemical and histochemical analyses indicated that muscle from decapitated fetuses was biochemically and chemically immature compared with that from normal fetuses.
mesh_terms: D000251:Adenosine Triphosphatases / Q000378:metabolism; D000818:Animals; D001921:Brain / Q000502:physiology*; D003655:Decerebrate State / Q000196:embryology / Q000378:metabolism / Q000662:veterinary*; D004950:Esterases / Q000378:metabolism; D050356:Lipid Metabolism; D008291:Malate Dehydrogenase / Q000378:metabolism; D009124:Muscle Proteins / Q000378:metabolism; D009132:Muscles / Q000166:cytology / Q000196:embryology* / Q000378:metabolism; D009210:Myofibrils / Q000201:enzymology; D009246:NADH Tetrazolium Reductase / Q000378:metabolism; D013552:Swine / Q000196:embryology*; D013553:Swine Diseases / Q000196:embryology* / Q000378:metabolism
chemical_list: D009124:Muscle Proteins; D008291:Malate Dehydrogenase; D009246:NADH Tetrazolium Reductase; D004950:Esterases; D000251:Adenosine Triphosphatases