家蠶蛾に於ける筋肉の退化
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概要
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While dissection a moth, emerged three days before, and stained by the injection of rongalit white, my attention was paid to the occurrence of some groups of free nerves in the dorsal part of the first and second abdominal segments. On close examination, it was revealed that they represent a part of the branches which innervate the dorsal skeletal muscles (Fig.1). Immediately after emergence, the majority of moths exhibit scarcely the sign of degeneration. After two or three days, especially after oviposition in females, the number of individuals showing degeneration increases greatly. The degeneration is confined to the muscles of the inner layer (Fig.1 and 2, mi, mid) and does not occur in other muscles, even after about ten days. The degeneration of the muscles, therefore, is not simply caused by inanition. The process of the muscular degeneration takes place as the following. At first, the muscles lose the strain and become easily disfigured. Soon the outline becomes irregular (Fig.2), and then the muscles disintegrate into numerous fragments. Finally they almost disappear, and their remnant is slightly found to be attached to the nerve fibers (Fig.4). Notwithstanding degeneration of the muscles, the nerves appear to present no trace of anatomical or histological change (Fig.3 and 4; mf, normal nuscle fibre; mfd, degenerated muscle fibre; ne, nerve ending). The present fact shows that the degeneration of anorgan does not necessarily result in the degeneration of other organs which stand in intimate relation to it. In this connection it is recalled that when cutting the nerve in some vertebrates, the degeneration is found in the taste-bud but not in the lateral-line sense organ (see WOELLWARTH, 1933).
- 社団法人日本動物学会の論文
- 1936-10-15