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THE HISTOCHEMICAL APPEARANCE OF DEVELOPING MUSCLE FIBRES IN THE GASTROCNEMIUS, SOLEUS AND ANTERIOR TIBIAL MUSCLES OF THE KITTEN, AS VIEWED IN SERIAL SECTIONS STAINED FOR LIPIDS AND SUCCINIC DEHYDROGENASE
Author(s) -
Hammarberg Cary
Publication year - 1974
Publication title -
acta neurologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.967
H-Index - 95
eISSN - 1600-0404
pISSN - 0001-6314
DOI - 10.1111/j.1600-0404.1974.tb02780.x
Subject(s) - succinic dehydrogenase , kitten , staining , anatomy , soleus muscle , biology , chemistry , medicine , biochemistry , cats , enzyme , skeletal muscle , genetics
Serial sections of the soleus, gastrocnemius (G) and anterior tibial (TA) muscles of kittens varying in age between newborn and 10 weeks were stained for succinic dehydrogenase, NADH, tetrazolium reductase and lipids. In the TA and G muscles of the youngest kittens the fibres exhibited a marked heterogeneity and already during the first postnatal week a number of them could be referred to four staining patterns according to which all fibres were classifiable after six weeks of age. Three of these staining patterns were correlated with those of the adult fibre types defined by Burke et al . (1973). In both the TA and G muscles the fibres destined to become slow twitch fibres were among the largest fibres found in the newborn kitten, but among the smallest 10 weeks later, indicative of a more rapid growth of the fast twitch fibres during the second postnatal month. The soleus fibres showed a differentiation into various staining patterns during the first postnatal month after which they gradually achieved a more homogeneous appearance. One fibre type, whose numbers increased with age, showed the same staining pattern as the future slow twitch fibre of the TA and G muscles.