Summary
Only three of the five types of monopolar cells which are present in each cartridge of the lamina have synaptic connections with receptor endings (R1–R6). Due to the distribution of their dendrites two of these (L1 and L2) contact the whole length of the six receptor endings of their cartridge whereas the third type (L3) contacts only their outer 2/3rds. Although these three cells may function as the second order neurons of the neurosuperposition eye, their anatomical relationship imply functional differences between them.
Zusammenfassung
Nur drei von den fünf Monopolarzelltypen L1, L2, L3, die in jeder Cartridge der Lamina vorhanden sind, sind synaptisch mit den sechs Rezeptorendigungen (R1–R6) verbunden. Entsprechend der Verteilung ihrer Dendriten sind zwei von den drei Neuronen (L1 und L2) zur gesamten Länge der Endigungen verbunden, während das dritte Neuron (L3) Verbindungen nur in dem äußeren Zweidrittel der Lamina hat.
Obwohl diese drei Zellen als Neurone 2. Ordnung des Neurosuperpositionsauges wirken könnten, deutet ihre anatomische Organisation auf funktionelle Unterschiede hin.
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We would like to thank Prof. V. Braitenberg and Dr. K. Kirschfeld for useful criticism and advice. Ms C. Herzhauser and C. Schröder provided technical assistance and Ms I. Kleinselbeck prepared the manuscript.
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Strausfeld, N.J., Campos-Ortega, J.A. L3, the 3rd 2nd order neuron of the 1st visual ganglion in the “neural superposition” eye of Musca domestica . Z.Zellforsch 139, 397–403 (1973). https://doi.org/10.1007/BF00306593
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DOI: https://doi.org/10.1007/BF00306593