PMID: 7407639Jul 1, 1980Paper

Hippocampal potentials evoked by stimulation of olfactory basal forebrain and lateral septum in the rat

Brain Research Bulletin
S R OvermannR L Bornschein

Abstract

Electrophysiological characteristics of olfactory-hippocampal relations were examined because recent anatomical studies have described a substantial olfactory input to the hippocampus via the entorhinal cortex. Potentials evoked in the dorsal hippocampus of anesthetized rats by stimulation of the prepyriform cortex, pyriform cortex, diagonal band, lateral olfactory tract, anterior commissure, olfactory tubercle and anterior olfactory nucleus had similar characteristics, although latencies differed. For example, latencies were twice as long after stimulation of the obliquely oriented portion of the diagonal band than after stimulation of the prepyriform cortex. A relatively low-amplitude, initially negative wave was recorded in the subiculum, CA1 and CA2, and a relatively high-amplitude, initially positive wave was recorded in CA4 and the dentate gyrus. In CA3 negative potentials were observed at dorsal recording sites and positive potentials were recorded at more ventral sites. Peak latencies were usually two to four msec shorter for the negative than for the positive wave. Laminar distributions of responses evoked in the hippocampus by stimulation of the prepyriform cortex and diagonal band were evaluated by driving eight elec...Continue Reading

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Related Concepts

Metazoa
Functional Cerebral Localization
Potentials, Event-Related
Structure of Subiculum Hippocampi
Neurons
Accessory Olfactory Bulb
Olfactory tubercle
Septum Pellucidum
Rats, Laboratory

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