Marine Mammal Sensory Systems by Ilya I. Glezer, Patrick R. Hof, Csaba Leranth, Peter J.

By Ilya I. Glezer, Patrick R. Hof, Csaba Leranth, Peter J. Morgane (auth.), Jeanette A. Thomas, Ronald A. Kastelein, Alexander Ya. Supin (eds.)

This publication is a suite of unique examine papers given at a symposium entitled "Sensory platforms and behaviour of Aquatic Mammals", hosted via the USSR Academy of Sciences. The assembly was once held in Moscow from sixteen to twenty-five October, 1991 and concerned approximately a hundred scientists from worldwide. the key headings of the publication correspond to the consultation themes on the symposium. This assembly was once no longer the 1st devoted to difficulties of sensory platforms in aquatic mammals. specialists during this box met a number of occasions formerly to debate very important difficulties of sensory features in echolocating animals. symposia on biosonar structures have been held in Frascati, Italy in 1966, then in Jersey, France in 1978, and in Helsingor, Denmark in 1986. Papers provided at those conferences have been released in books that complicated considerably the certainty of sensory structures (Busnel and Fish, 1980; Nachtigall and Moore, 1988). at first, echolocating bats have been the most topics of attention. in spite of the fact that, stories on echolocating aquatic mammals, whales and dolphins, elevated from one assembly to the subsequent. certainly, aquatic mammals are of outstanding curiosity for learning the difference of sensory features for echolocation in particular aquatic environments. As a traditional final result of those advancements, the 1989 symposium in Rome was once committed particularly to the sensory structures of cetaceans (Thomas and Kastelein, 1990). This symposium was once held in the 5th foreign Theriological Congress and was once attended through many scientists.

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In phylogenetically progressive mammals (primates) calbindinand parvalbumin-positive populations are almost equal in their relative concentrations. , 1991; Rausell and Jones, 1991 a, b). Thus, in the somatosensory system, phylogenetically progressive lemniscal projections are parvalbumin-positive and their main target in the somatosensory cortical area is layer IV which is enriched with parvalbumin-positive perikarya. On the other hand, nonlemniscal and phylogenetically older nociceptive pathways are calbindin-positive and have as their cortical targets layers I and II (Rausell and Jones, 1991 a, b).

The cytochrome oxidase-positive perikarya are large pyramidal (arrow) and large and giant nonpyramidal cells (arrowheads). The dashed lines signify the borders of layer IIIc/V. (b) Bipolar cytochrome oxidase-positive cells with fusiform shape of the perikaryon and long cytochromeoxidase-positive dendrites (arrowheads). (c) Horizontally oriented cytochrome oxidasepositive bipolar cell (arrow), as seen also in Fig. lOA. The dashed lines signify the borders of layer IIIc/V and are curved due to plane of section.

A similar diameter range and a slightly larger mean diameter of cochlear fibers in Neophocaena were obtained. The fiber diameter spectrum is similar among Tursiops, Delphinus, Neophocaena and Sousa, but a narrower range and smaller mean value were found in Lipotes. The results revealed a range, mode and maximum diameter of cochlear fibers in these small odontocetes 2-5 times those in the cat, monkey, guinea pig, and mysticetes. 48 Table 3. 98 Balaenoptera physalus Balaenoptera borealis Balaenoptera acutorostrata Megaptera novaeangliae Rabbit Cat Man 77,500 t 162,700 c 165,600 c 149,800 c 109,400 c 92,500 c 77,200 d 64,200·,t 1.

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