NITRIC OXIDE-ERGIC ORGANIZATION OF MEDULLAR CRANIAL NUCLEI IN TELEOST FISHES
E. V. Puschina
Institute of Marine Biology, Far East Branch of RAS, Vladivostok;
e-mail: puschina@mail.ru
Traditional neuromorphological and NADPH-diaphorase methods were used to study and compare the topography
and localization of medullar nuclei NO-ergic neurons in four teleost species: Pholis nebelosis, Hexagramus
octogrammus, Carassius carassius and Pholidapus dybowskii. The peculiarity of medullar nuclei organization
in teleost fishes consists in the weak topological disconnection of sensor and motor components with pronounced
heteromorphism in their structure and the presence of subpopulations in their composition. In the fishes
studied, NADPH-diaphorase was found in the trygeminal, octavo-lateral, facial, glossopharingeal and vagal
nuclei. The number of NO-ergic neurons in the trygeminal nucleus was marginal and made up 9-14 % of the
total cell number. About 40-60 % of NO-ergic cells were found in the octavo-lateral, facial, glossopharingeal
and vagal nuclei.
Key words: teleosts fishes, NADPH-diaphorase, medullar nuclei
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