Effects of Gustatory Stimulants upon the Olfactory Epithelium of the Bullfrog and the Carp

Abstract

Effects of various gustatory stimulants upon the olfactory epithelia were examined in the olfactory bulb of the bullfrog and the carp.

Stimulation of the Olfactory Epithelium with Odorants in Gaseous and Aqueous Phases

“…Induced waves and single cell discharges of the olfactory bulb were recorded also by the same procedures as before (TAKAGI et al, 1978a).…”

Water response of the frog olfactory epithelium as observed from the olfactory bulb.

“…The water response was also observed in the labellar chemosensory hairs of the fly (Wolbarsht, 1957;Evans & Mellon, Jr., 1962;Rees, 1970). Takagi, Iino & Yarita (1978) found that the water response was also produced by stimulation of the frog olfactory epithelium with distilled water. The present study was undertaken to confirm the water response of the frog olfactory epithelium and to investigate the response characteristics.…”

Ionic Stimulation of the Olfactory Epithelium in the Bullfrog and the Carp

“…In order to examine the effects of ions in various concentrations, 1 M solutions of NaCl, RbCI, Na4Fe(CN)6 or Na2SO4 were diluted by distilled water and 2-1, 2-2, 2-3 ... 2-12 and 2-13 M solutions were prepared. When the effects of the osmotic pressure of the stimulating solutions were examined, isotonic (6 %) sucrose solution which had been found to have no stimulating action by itself (TAKAGI et al, 1978), was used and various hypertonic and hypotonic sucrose solutions were prepared.…”

“…HARA and GORBMAN (1967) disclosed in the goldfish that a similar rhythmic wave is induced in the olfactory bulb by a sodium chloride solution which is applied to the olfactory epithelium. In a previous paper (TAKAGI et al, 1978), it was shown that the olfactory cells are stimulated by many gustatory stimulants except the sweet solutions. In the fish, it was also proven that the olfactory receptor cell is sensitive not only to odors in aqueous phase but also to mechanical stimuli (ADRIAN and LUDWIG, 1938 ;TAKAGI et al, 1978).…”

“…In a previous paper (TAKAGI et al, 1978), it was shown that the olfactory cells are stimulated by many gustatory stimulants except the sweet solutions. In the fish, it was also proven that the olfactory receptor cell is sensitive not only to odors in aqueous phase but also to mechanical stimuli (ADRIAN and LUDWIG, 1938 ;TAKAGI et al, 1978). Consequently, it was supposed that the olfactory receptor cell has a property of responding to stimuli of various kinds, including odorous substances.…”