Abstract
By methods of histochemical marking of NADPH-diaphorase and immunohistochemical marking of cystathionine-beta-synthase (CBS), the presence and distribution of NO and H2S-synthesizing elements in thoracic ganglion are shown in two crab species Eriocheir japonicus and Pugettia quadreidens. In the thoracic ganglion, NO and H2S have been established to be synthesized by different neurons. The high CBS activity in efferent elements--segmentary motoneurons, interneurons, and nerve fibers in the extremity neuropil--indicates involvement of hydrogen sulfide in organization of the crustacean motor behavior. The presence of H2S-synthesizing neurons in the wall of sternal artery in E. japonicus allows suggesting participation of H2S in regulation of vascular tonus.
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