Summary
Each optic cartridge in the lamina of Diptera1 gives rise to a bundle of fibres composed of the prolongations of at least 11 neurons (two first order receptors, R7 and R8, five monopolar cells, L1–L5 and four “centrifugal” cells, T1, T1a, C2 and C3). The bundles project to the outer surface of the second synaptic region, the medulla. The projection patterns of the bundles means that a point for point map of the cartridge arrangement in the lamina is conferred on the medulla. The cross-over of bundles, along the horizontal axis of the eye, merely reverses the lamina map on the medulla. All eleven fibres that enter a bundle at the lamina are contained within it as far as the medulla.
Similar content being viewed by others
References
Braitenberg, V.: On chiasms. In: Neural networks (Proceedings of the school on Neural Networks, June 1967 in Ravello, ed. E. R. Caianello). Berlin-Heidelberg-New York: Springer 1968.
—: Ordnung und Orientierung der Elemente im Sehsystem der Fliege. Kybernetik 7, 235–242 (1970).
Cajal, S. R., Sanchez, D.: Contribución al conocimiento de los centros nerviosos de los insectos. Parte 1. retina y centros opticos. Trab. Lab. Invest. Biol. Univ. Madr. 13, 1–168 (1915).
- Sobre la estructura de los centros nerviosos de los insectos. Revta. Chilena Hist. Nat. 1–18 (1921).
Horridge, G. A., Meinertzhagen, I. A.: The accuracy of the patterns of connexions of the first- and second-order neurons of the visual system of Calliphora. Proc. Roy. Soc. B 175, 69–82 (1970).
Kirschfeld, K.: Die Projektion der optischen Umwelt auf das Raster der Rhabdomere im Komplexauge von Musca. Exp. Brain Res. 3, 248–270 (1967).
Strausfeld, N. J.: Golgi studies on insects. Part II. The optic lobes of Diptera. Phil. Trans. Roy. Soc. Lond. B 258, 135–223 (1970).
—, Blest, A. D.: Golgi studies on insects. Part I. The optic lobes of Lepidoptera. Phil. Trans. Roy. Soc. Lond. B 258, 81–134 (1970).
Trujillo-Cenóz, O.: Some aspects of the structural organisation of the Medulla in Muscoid flies. J. Ultrastruct. Res. 27, 533–553 (1969).
Author information
Authors and Affiliations
Additional information
These investigations were carried out at the Zoologisches Institut, Frankfurt am Main and at the Max-Planck-Institut für Biologische Kybernetik, Tübingen, with the support of an Alexander von Humboldt Stipendium. I am grateful to Professor Burkhardt and Dr. V. Braitenberg for the hospitality of their respective Departments. I also thank Drs V. Braitenberg and J. Campos-Ortega for reading and discussing the manuscript. Thanks are also due to Mr. E. Freiberg for the preparation of figure 5 and to Mrs. K. Schwertfeger for typing the manuscript.
Rights and permissions
About this article
Cite this article
Strausfeld, N.J. The organization of the insect visual system (Light microscopy). Z. Zellforsch. 121, 442–454 (1971). https://doi.org/10.1007/BF00337641
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00337641