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Topographic anatomy of ascending and descending neurons of the supraesophageal, meso- and metathoracic ganglia in paleo- and neopterous insects

  • Comparative and Ontogenic Physiology
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Abstract

Topographic anatomy of ascending (AN) and descending (DN) neurons of the supraesophageal and thoracic ganglia in the nervous system of winged insects (Pterygota), representatives of the infraclasses Palaeoptera (Odonata, Aeschna grandis, dragonfly) and Neoptera (Blattoptera, Periplaneta americana, cockroach), was studied. These insects differ in ecological niches, lifestyles, sets of behavioral complexes, levels of locomotor system development, evolutionary age and systematic position. Cell bodies and processes of ANs and DNs were stained with nickel chloride (NiCl2), and their topography was studied on total preparations of the supraesophageal and thoracic ganglia. Unlike cockroaches, the dragonfly protocerebrum was found to contain DNs sending their processes to ocelli. Dragonfly DN processes exhibit a specific branching pattern in thoracic ganglia, with collaterals coming off both ipsi- and contralaterally. In cockroaches, collaterals of DN processes come off ipsilaterally. The AN cell bodies in dragonfly meso- and metathoracic ganglia lie both ipsi- and contralaterally relative to the ascending process, whereas in cockroaches most of the AN cell bodies in the same ganglia are located contralaterally. Substantial differences in the distrubution of DNs and ANs in insects with different manners of locomotion appear to reflect different degrees of control the supraesophageal ganglion exerts over the activity of segmental centers. This does not seem to be related to the evolutionary age of insects or their systematic position. Probably, different degrees of control over locomotion depend on the way of food acquisition: catching prey in the air in “paleopterous” dragonflies versus maneuverable walking or running over a solid substrate in “neopterous” cockroaches.

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Authors and Affiliations

  1. Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, St. Petersburg, Russia

    I. Yu. Severina, I. L. Isavnina & A. N. Knyazev

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  1. I. Yu. Severina
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  2. I. L. Isavnina
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  3. A. N. Knyazev
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Correspondence to I. L. Isavnina.

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Original Russian Text © I.Yu. Severina, I.L. Isavnina, A.N. Knyazev, 2016, published in Zhurnal Evolyutsionnoi Biokhimii i Fiziologii, 2016, Vol. 52, No. 5, pp. 362—370.

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Severina, I.Y., Isavnina, I.L. & Knyazev, A.N. Topographic anatomy of ascending and descending neurons of the supraesophageal, meso- and metathoracic ganglia in paleo- and neopterous insects. J Evol Biochem Phys 52, 397–406 (2016). https://doi.org/10.1134/S0022093016050082

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  • DOI: https://doi.org/10.1134/S0022093016050082

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