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Quarterly Journal of Microscopical Science, Vol s3-104, 135-140, Copyright © 1963 by Company of Biologists

Electron Microscopy of the Development of Tracheoles in Drosophila Melanogaster

S. AHMAD SHAFIQ 1

1 Department of Anatomy, University of Washington, Seattle, Washington, U.S.A. Present address, Institute for Muscle Disease Inc., New York, U.S.A.

The tracheoblasts associated with the flight-muscles of Drosophila were studied by electron microscopy. During the developmental stages the cytoplasm of such tracheoblasts shows extensive membrane structures arranged in whorls. It seems that these membranes become aligned in pairs, spread out in tracheoblast cytoplasm, and form the walls of the new tracheolar vessels. The membranous whorls appear to have no obvious relationship with the usual endoplasmic reticulum, Golgi apparatus or plasma membranes. They are probably produced from certain large granules distributed irregularly in the cytoplasm of the young tracheoblasts.

Membranes limiting the tracheoles from the tracheoblast cytoplasm (the so-called mestracheons) are not usually seen in the younger stages. They are sometimes seen after the cuticular lining of the tracheoles has been formed.






© The Company of Biologists Ltd 1963