ネコ軟口蓋筋の組織化学的研究　1. Succinic Dehydrogenase 活性について

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  • Histochemical Observation on Soft Palate Muscle of Cat. 1. Succinic Dehydrogenase Activity
  • ネコ軟口蓋筋の組織化学的研究
  • ネコ ナンコウガイ キン ノ ソシキ カガクテキ ケンキュウ

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The soft palate muscle of the cat （consisting of M. levator veli palatini, M. tensor veli palatini and M. palatinus） was studied histochemically for SDH activity and the following results were obtained. 1） M. levator veli palatini is composed of two types of fibers; red and intermediate. Most fibers （61%） are intermediate with no differences in the diameters between the types of fibers. 2） M. tensor veli palatini is composed of two types of fibers; red and intermediate with proportions of 37% and 63%, respectively. In diameter, intermediate fibers are larger than the red fibers. 3） M. palatinus is composed of three types of fibers; red, white and intermediate, with proportions of 24%, 22% and 56%, respectively. There are no differences in diameters among the three of fibers. In comparison to M. gastrocnemius, the SDH activity of these muscle fibers was relatively high. 4） In a cross-section of individual fiber, the reticular structure （network） was observed. This structure was ribbon-like in red fibers, but had thin lines randomly throughout the intermediate and white fibers. Diformazan particles were observed, particularly a number of particle in the red muscle fiber. 5） It was confirmed that M. gastrocnemius is composed of three types of fibers; red, white and intermediate, in proportion of 20%, 56% and 24%, respectively. The diameter of red muscle fiber is the smallest, while that of white muscle fiber is the largest. M. soleus is composed of two types of fibers; red and intermediate. Most fibers （72%） are intermediate with no differences in the diameters between the types of fibers. On the basis of these results, it was clarified that the M. levator veli palatini and M. tensor veli palatini of the soft palate muscle of the cat are composed of red and intermediate fibers, while the M. palatinus is composed of red, white and intermediate fibers.

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