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Differentiation and Metamorphosis of the Imaginal Optic Glomeruli in Drosophila

Institute of Animal Genetics, Edinburgh

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

Received for publication 25 November 1955.

SUMMARY

Short descriptions of certain parts of the brain of Drosophila have been given by a few workers. Richard & Furrow (1925) briefly considered the optic ganglia in their study of the eyeless mutant. Others have given a more generalized account of the different brain glomeruli (Hertweck, 1931; Strasburger, 1932; Power, 1943). However, no study has been made of the extent of differentiation of the imaginal brain in the larvae nor has there been any investigation of its development during metamorphosis.

In the present work a description of the differentiation and metamorphosis of the optic glomeruli will be given. Material was collected at 5-hourly intervals, from hatching till 50 hours after the formation of the puparium. Hot Bouin was used as a fixative. Larvae were treated by Peterfi's celloidin method of double embedding. Puparia-free pupae were transferred to amyl acetate after being dehydrated in 90 per cent, alcohol.

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