Glycoconjugate expression in the olfactory bulb of the premetamorphic larva of the Japanese sword-tailed newt (Cynops ensicauda).

We examined the organization of the olfactory organ and assessed the lectin histochemistry to investigate the glycoconjugate distribution of the olfactory bulb in premetamorphic larvae of Cynops ensicauda. The nasal cavity was an oval chamber that contained olfactory epithelium and a primitive vomeronasal organ. Secretory products were found in the supporting cells of the two sensory epithelia and in the respiratory cells. Ten lectins bound to the olfactory and vomeronasal nerve fibers as well as to the glomeruli in the olfactory bulb. The binding intensity in larvae was weaker than that reported previously in mature animals. This difference suggests a functional correlation between the expression change of glycoconjugates and the developmental refinement of the olfactory system during metamorphosis.