Summary
Neuronal projections from one optic lobe to other parts of the brain were stained in the cricket Gryllus campestris using the cobalt sulphide technique and Timm's sulphide-silver method.
The results are: Four tracts directly connect the medulla with the lobula and medulla of the contralateral optic lobe. Direct medullar projections end mainly in the non-glomerular neuropile of the protocerebrum, but also penetrate the calyx of the mushroom bodies, pons and central body in small numbers. A few somata which send fibres into the medulla lie in the pars intercerebralis, in the protocerebrum ventral to the opposite β-lobe, the outer margin of the medulla of the contralateral optic lobe and between deutoand tritocerebrum.
The anatomical and physiological relevance of the stained connections is discussed.
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Dedicated to Professor B. Rensch on his 75th birthday.
Supported by the Deutsche Forschungsgemeinschaft, grant Ho 463/4+7.
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Honegger, H.W., Schürmann, F.W. Cobalt sulphide staining of optic fibres in the brain of the cricket, Gryllus campestris . Cell Tissue Res. 159, 213–225 (1975). https://doi.org/10.1007/BF00219157
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DOI: https://doi.org/10.1007/BF00219157