Topographical relation between the olfactory bulb and the olfactory tract in tench (Tinca tinca L)

Electrical activity was recorded from single cells in the olfactorybulb when electrically stimulating the medial and lateral olfactorytract and when stimulating the olfactory epithelium with aminoacids. Bulbar units excited by stimulation of the medial olfactorytract were found in the medial and middle parts of the bulb.Neurones in the dorso-lateral part of the bulb were excitedby stimulation of lateral tract. Units inhibited by stimulationof the lateral or medial olfactory tracts had a reversed distributionwith the majority found in the medial or lateral parts of thebulb respectively. The chemicals tested induced changes in thedischarge of units mainly situated in the lateral part of thebulb.