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  • Title: Neurophysiology of limbic system pathways in the rat: projections from the amygdala to the entorhinal cortex.
    Author: Finch DM, Wong EE, Derian EL, Chen XH, Nowlin-Finch NL, Brothers LA.
    Journal: Brain Res; 1986 Apr 09; 370(2):273-84. PubMed ID: 2423179.
    Abstract:
    We studied the responses of rat entorhinal neurons to electrical stimulation of the amygdala. Four main results were obtained: (1) excitatory postsynaptic potentials were recorded in entorhinal neurons in response to electrical stimulation of the amygdala. Cells in layers II, III and V of the entorhinal cortex were responsive. (2) Excitatory responses were followed by inhibitory postsynaptic potentials. (3) Frequency potentiation of both excitatory and inhibitory responses was observed when 10/s stimulation was used. (4) Three amygdala neurons were antidromically activated by entorhinal stimulation; and two layer II entorhinal cells that were excited by amygdala stimulation were also antidromically activated by dentate gyrus stimulation. These results provide evidence for a monosynaptic, excitatory projection from the amygdala to the entorhinal cortex. In addition, the data indicate that amygdala neurons are only one synapse removed from the excitation of dentate gyrus granule cells.
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