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  • Author or Editor: P.C. Diegenbach x
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Morphometric analysis was carried out on wing muscles of the House Fly (Musca domestica), ranging from the pupation period to death. In the first week a clear increase was found in the percentage of food reserve consumed by the cell components. Both fibrils and sarcosomes increase in circumference during the first week. The sarcosomes then fuse.

After the first week few changes occur. The sarcosomal volume increases in male flies. No disintegration or degeneration of the muscle cells appears with old age. Even the fact that the wing of the male flies exhibits abrasion earlier than that of females cannot be correlated with changes in the wing muscles. The ratio of fibrils to sarcosomes is greater than two to one. This ratio differs in males and females.

A gradual decrease in the number of cristae per sarcosome was observed during ageing. This can influence the total activity of the sarcosome. The succinate dehydrogenase reaction is not dependent on age. The presence of two types of sarcosomes is unlikely. Sarcosomes with more cristae are of a darker colour than those with few cristae.

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In: Bijdragen tot de Dierkunde

Since the description of a helicoidal pattern of muscle fibres in teleost fishes by Van der Stelt (1968), Alexander (1969) stated that there are two basic patterns. One is found in selachians and primitive bony fishes as Anguilla and Sal mo, whereas it is also found in the caudal peduncles of teleosts, which are considered more advanced. More anteriad a quite different pattern is found, resembling the helicoidal pattern. The elucidation of this pattern was disclosed by both Van der Stelt (1968) and Alexander (1969) by reconstruction from horizontal, as well as vertical serial sections. Van Raamsdonk et al. (1974), in a study of the early development of the myomeres of Brachydanio rerio, observed a transition of a primary longitudinal course of muscle cells to a presumably helicoidal one in transverse sections of the embryo.

As it is more easy to obtain and interpret a series of transverse sections, we have tried to devise a method of reconstruction of the muscle fibre course, starting from transverse sections. With some caution, the results of these studies on Brachydanio may be summarized as follows:

1. The embryo starts with a primordial, longitudinal muscle cell orientation.

2. In the young embryo the muscle cell orientation changes to a helicoidal one.

3. A further change in conformity with Alexander’s primitive pattern is found in later stages of development.

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In: Bijdragen tot de Dierkunde