THE HISTOLOGICAL CHANGES IN THE EXTREMITIC MUSCLE UNDER THE INFLUENCE OF DYNAMIC AND STATIC FACTORS IN MICE
- VernacularTitle:动、静力因素对动物四肢肌组织结构变化的影响
- Author:
Feng YANG
- Publication Type:Journal Article
- From:
Acta Anatomica Sinica
1957;0(04):-
- CountryChina
- Language:Chinese
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Abstract:
For a period of 3 months,an experimental exercise under the influence of dynamic and static factors was given to 3 groups (15 each) of mice.The histological changes of the extensor muscle of the post extremities of these mice were examined by the Bielschowsky-Gros and H.E.methods.The result,as compared with that of the control group,was summarized as follows: 1.The structural changes of the muscle fibers differ in different groups under the influence of different mechanical factors,for instance,under the influence of static factors either the muscle fibers as a whole or their nuclei were enlarged mainly along the trans- verse diameter. 2.The increase in number of nuclei of the muscle was observed in the experi- mental animals among which the dynamic type was most conspicuous.This increase was not only related to the character of mechanical factors,but also the intensity of the muscular activity. 3.Under mechanical factors,the nuclei of the muscles were increased both in number and in size.Under the influence of dynamic factors,the nuclei increased pre- dominantly in length (long type nuclei) while under the influence of static factor,its in- crease was mainly along the transverse direction.In the latter the transverse diameter of the long type nuclei was also wider and tends to become oval in shape.It is,therefore, assumed that the type and number of the nuclei of the muscle cells depend upon the func- tional activity of the organ and the character of the force acting upon it. 4.After a long period of exercise,either by means of dynamic or static factor, a large number of annular nuclei was found in the muscles.This phenomenum has not been reported in the literature.
