Electrophysiological studies of centrifugal and centripetal connections of the anterior olfactory nucleus

In order to investigate the role of anterior olfactory nuclei in the interbulbar connections, systematic exploration of all possible pathways interconnecting both olfactory bulbs, anterior olfactory nuclei (A.O.N.) and the anterior limb of the anterior commissure was undertaken. Electrical stimulation and field potential recording were extensively used. Olfactory bulb stimulation results in a positive-negative diphasic response in the A.O.N. lasting 80–200 msec. It is demonstrated that: (a) axonal fibers of mitral as well as tufted cells send collaterals in the ipsilateral A.O.N., and (b) the synaptic relay of the interbulbar fibers lies in the ventro-lateral part of the A.O.N.