Summary
The Lamina ganglionaris (first optic neuropile) of the decapod crustacean Pandalus borealis has its optic cartridges (synaptic compartments) arranged in horizontal rows. Each optic cartridge contains seven receptor axon terminals and the branching axis fibres of five monopolar second order neurons.
Four types of monopolar neurons are classified. Their cell bodies are arranged in two layers. The inner layer contains the cell bodies of exclusively one of these types, and each cartridge is invaded by two neurons of this neuron type (type M 1: a and M 1: b). The outer layer contains the cell bodies of the remaining three types (M 2, M 3 and M 4). One gives rise to a large radially branched axis fibre in the centre of the cartridge. The other two have wide branches which may make inter-cartridge contacts, one proximally and the other distally in the plexiform layer, which is clearly bistratified. The receptor axons terminate in two levels corresponding to these strata.
Two sets of tangential fibres form networks in the proximal and the mid-portion of the lamina. Both networks have fibres with primary branches in the vertical plane and secondary branches in the horizontal plane. The fibres of the networks are derived from axons that pass from the second optic neuropile, the medulla externa.
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I thank Professor V. Braitenberg who provided facilities for part of the work at the Max Planck Institut für biologische Kybernetik, Tübingen, Germany, and Dr. N.J. Strausfeld for technical advice and for reading the manuscript. I also thank Dr. R. Elofsson for fruitful discussions and critical reading of the manuscript, and Mr. L. Erdös and Miss I. Norling for preparing the photographic prints, and the staff of Biologisk Stasjon, Espegrend, Norway for skilful help. The Swedish Natural Science Research Council (Grant No. 2760-007) supported the work.
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Nässel, D.R. The Organization of the lamina ganglionaris of the prawn, Pandalus borealis (Kröyer). Cell Tissue Res. 163, 445–464 (1975). https://doi.org/10.1007/BF00218491
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DOI: https://doi.org/10.1007/BF00218491