Olfactory connections of substantia innominata and nucleus of the horizontal limb of the diagonal band in the rat: an electrophysiological study.
Extracellular unit recordings performed on 113 spontaneously discharging neurons in the substantia innominata-nucleus of the horizontal limb of the diagonal band region revealed that 46 (41%) were transsynaptically discharged or inhibited following stimulation of the main and accessory olfactory bulb (MOB, AOB) and the prepyriform cortex (PPC). A significantly greater number of cells were responsive to MOB and PPC than to AOB shocks. Eight (7%) neurons were antidromically invaded following MOB volleys. These findings suggest that the MOB has functional reciprocal connections with the 'ventral striatum', a region which can function, presumably as a nodal point for convergence of visual, gustatory and olfactory information relevant to feeding and drinking behavior.
D000679:Amygdala / Q000502:physiology; D000818:Animals; D001369:Axons / Q000502:physiology; D001931:Brain Mapping; D002490:Central Nervous System / Q000502:physiology*; D004558:Electric Stimulation; D005071:Evoked Potentials; D005917:Globus Pallidus / Q000502:physiology*; D007031:Hypothalamus / Q000502:physiology; D009433:Neural Inhibition; D009474:Neurons / Q000502:physiology; D009830:Olfactory Bulb / Q000502:physiology*; D009833:Olfactory Pathways / Q000502:physiology*; D051381:Rats; D011930:Reaction Time / Q000502:physiology; D013569:Synapses / Q000502:physiology; D009435:Synaptic Transmission