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Fig. 8. Site-specificity of tetanus-induced plasticity in alpha lobe-extrinsic
neurons. (A) Each MB consists of two halves. One half is composed of K-cells
with their somata and dendrites in the median calyx (m), and another half has
somata and dendrites in the lateral calyx (l). The axons of the K-cells fuse
in the peduncle and send their collaterals into the alpha lobe (
).
There the lateral and the median sectors house the axon collaterals of the
respective calyces. All alpha lobe-extrinsic neurons that we marked in the
course of our study branched across the whole alpha lobe, making it very
likely that they receive input from both median and lateral K-cells. (B) This
Pe1 neuron responded with depression after tetanus to the lateral calyx.
Depression was found for the test stimuli to both the median (filled
triangles) and the lateral calyx (open triangles). The delayed augmentation
effect, however, was site-specific. Only the input from the tetanized calyx
augmented. (C,D) Two examples from unidentified alpha lobe-extrinsic neurons
for site-specific facilitation induced by tetanus. Again the tetanus was
applied to the lateral calyx, and the responses to test stimuli in the median
(filled triangles) and lateral (open triangles) were monitored during
successive minutes. The ordinate in the diagrams gives the number of spikes
elicited by a single stimulus, and the abscissa time in min. The stimulus
artefacts in B, C and D mark the test pulses.
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