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Zusammenfassung:
A method was developed for the numbering of the 3,000 subunits of the lamina ganglionaris on eleotronmicroscopical preparations. Thus measurements of fiber size could be related to the position of the elements on a map of the ganglion. A striking gradient of the thickness of one of the lamina neurons, L3, was found to be correlated with the size of the corresponding lenses of the compound eye. The size of two more second order neurons, L1 and L2 also varies depending on their position in the ganglion, but according to a pattern different from that of the variation of L3. These findings are discussed in connexion with current models of movement perception in the fly.
