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Localization of the clock controlling circadian rhythms in the first neuropile of the optic lobe in the housefly

Monika Balys and Elzbieta Pyza*

Zoological Museum, Institute of Zoology, Jagiellonian University, Ingardena 6, 30-060 Kraków, Poland



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  		Fig. 1. (A) Frontal section of the optic lobe of Musca domestica. re, retina; la, lamina; me, medulla; lo, lobula. Arrows indicate the site of lesioning. Scale bar, 100 µm. (B) Light micrographs of the proximal lamina at the level of the external chiasma (ch), showing cross- sectioned photoreceptor terminals at proximal (p) and distal (d) depths in the lamina neuropile. Scale bar, 20 µm. (C) A single cartridge of the lamina comprises photoreceptors (R) and five monopolar cells. Two large monopolar cells, L1 and L2, are located at the axis of every cartridge. Scale bar, 1 µm. (D) The optic lobe of the housefly after lesioning stained with anti-PDF serum. The large PDF cell bodies (asterisk) and processes in the medulla are present in a cut-off part of the optic lobe. Arrows indicate the site of lesioning. Scale bar, 100 µm.

 


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  		Fig. 2. The axonal cross-sectional areas of L1 (A) and L2 (B) monopolar cells in control (CONLD, CONDD, CONLL) and experimental (LD, DD, LL) flies under light and dark conditions (L:D 12 h:12 h), measured at ZT1 and ZT13 and in flies maintained in constant darkness (DD) and continuous light (LL) measured at CT1 and CT13. Values are means ± S.E.M. The number of flies in each group is given at the top of each column. The asterisks indicate statistically significant differences.

 




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