title: Gastric chemoceptive projections to fasciculus solitarius and its dipole field structure.
abstract: The gastric branch of the vagus nerve, close to the stomach was stimulated electrically and the evoked potentials recorded from the fasciculus solitarius of frog within the stereotaxic coordinates P 4.1-4.6; L 0.5-0.8 and V 0.3-0.5. A predominantly monophasic negative potential, the amplitude (1.0-3.0 mV) of which rises with increase in stimulus strength up to 6 V, could be recorded. From the velocity of conduction (30 m/sec) it appears that the gastric afferent fibres belong to Group A. The depth-recording resulted in the reversal of the negative sign of the potential at depth beyond 180-200 mu. The significance of the appearance of a positive potential and the cellular configuration of the area of fasciculus is discussed in the context of a possible dipole that might exist in the spatial structure from which the depth-recording has been made.
mesh_terms: D000818:Animals; D001001:Anura; D001931:Brain Mapping; D001933:Brain Stem / Q000502:physiology*; D002628:Chemoreceptor Cells / Q000502:physiology*; D005071:Evoked Potentials; D009475:Neurons, Afferent / Q000502:physiology; D009830:Olfactory Bulb / Q000502:physiology; D011930:Reaction Time / Q000502:physiology; D013270:Stomach / Q000294:innervation*; D014630:Vagus Nerve / Q000502:physiology*