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Developmental Interactions in the Development of the Imaginal Muscles of Drosophila

Institute of Animal Genetics, Edinburgh

¹ Author's address: Department of Zoology, Faculty of Science, Alexandria University, Egypt.

Received for publication 13 October 1955.

SUMMARY

The thorax of Drosophila, which is made up in the main by the mesothorax, contains two main groups of muscles. There is a dorsal set composed of six pairs of fibriiiar muscles (Plate l, fig. 1). The lateral set of each side (Plate 1, fig. 2) comprises three tergosternal, two tergal remoters of the coxa, two dorsal oblique lateral muscles, and three trochanteral depressors of the three legs, of which the second (mesothoracic) is the largest. All these muscles with the exception of the trochanteral depressors are indirect flight-muscles and take an active part in the mechanism of flight. All, with the same exception, are fibriiiar in structure. The trochanteral depressors have a structure which is referred to as tubular and are probably concerned with the movement of the legs.

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