By Prof. Dr. Henning Scheich, Prof. Dr. Sven O. E. Ebbesson (auth.)
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Extra info for Multimodal Torus in the Weakly Electric Fish Eigenmannia
37. A In a section slightly caudal to Fig. 36C, HRP-containing cells (a"ows) are found in the perilemniscal nucleus (PL), the intermediate nucleus (MOLi), and in the ventral nucleus (MOL v) of the medial octavolateralis area. B Slightly caudal to the level of A, a reticular neuron (R) is stained on the side contralateral to the injection 58 Fig. 38. A At a level slightly caudal to Fig. 37B, a few HRP-containing neurons (arrows) are found in the ipsilateral reticular formation (R) and in the contralateral intermediate nucleus (MaLi) of the medial octavolateralis area.
The electrosensory input is distributed mainly to the odd-numbered layers 5, 7, 9, and 11 and to layer 10. The tectal input is mainly to layers 10, 11, and 14. Thus there is evidence that portions of the deep layers (10, 11, 14, and 15) have indeed a visual input: (a) the neurons in SGC that project to the torus have dendrites extending into SGFS where the retinal fibers terminate (Ebbesson et al. 1981) and (b) torallayers 14 and 15 have a small direct input from the contralateral retina (Ebbesson et al.
In this HRP study in the leopard frog (Wilczynski and Northcutt 1977), no HRP-Iabeled cells were found in the torus following tectal injections. This may, however, reflect a specialization in frogs, since the torotectal projection can be predicted as being a general feature of vertebrates by the presence in Eigenmannia and by the demonstration of the tectotoral connections in such diverse groups of vertebrates. One can only speculate about the implications of the mutual influence of electrosensory and visual modalities.