[Cytologic characteristics of "dark" and "light" cells in the brain amygdaloid complex].

This paper reports data on cytological peculiarities of neurons of two main zones of sexual dimorphism in brain amygdala (dorsomedial nucleus and anterior cortical nucleus). The main attention was paid to some characteristics of "dark" and "pale" cells found in the amygdaloid complex for the first time. It is supposed that the dark and pale cells are targets for gonadal steroids, whose cyclic changes in concentration in the blood difined their functional states.

Selective suppression of forward and recurrent "rapid" inhibition by local application of picrotoxin in area CA1 of rat hippocampal slices.

Living slices of rat hippocampus were used to study the possibility of suppressing forward and recurrent "rapid" inhibition in area CA1 by local application of picrotoxin, an antagonist of ionotropic gamma-aminobutyric acid (GABAA) receptors. Application of picrotoxin to the apical dendrites increased the duration of focal potentials recorded in the radial layer (143.0 +/- 7.

[Selective suppression of the direct and feedback "fast" inhibition during local administration of picrotoxin in the CA1 region of rat hippocampal slices].

Application of picrotoxin to apical dendrites in the CA1 area of the rat hippocampal slices increased the duration of focal potentials (FP) in the stratum radiatum but did not affect the unit activity spikes' amplitude in the stratum pyramidalis, the finding suggesting a suppression of the feed-forward inhibition with no effect upon the recurrent one. The data obtained shows that, under conditions normally used for studying the NMDA-EPSP feed-forward, the inhibition is not invariably suppressed and may affect the results of the studies.