Summary
Synaptic contacts between GABA-immunoreactive neurons, antennal receptor fibers and non-GABA-immunoreactive neurons in the glomerular neuropil of the antennal lobes have been identified by means of a combination of (i) immunohistochemical labeling and (ii) labeling of afferent fibers of the antenna by experimentally induced degeneration. Characteristic contacts of these neurons are: a) Serially arranged polysynaptic contacts between degenerated antennal fibers, GABA-immunoreactive neurons and non-GABA-immunoreactive neurons. b) Monosynaptic contacts between degenerated antennal fibers and non-GABA-immunoreactive neurons. c) Reciprocal synaptic contacts between immunostained and non-stained neurons and synaptic contacts between individual GABA-immunoreactive neurons. d) Synaptic output contacts of GABA-immunoreactive neurons with degenerated antennal fibers.
GABA-immunoreactive neuron profiles in the glomeruli are assigned to multiglomerular local interneurons (Distler 1989a); non-immunolabeled profiles may be assigned to projection neurons and other not yet identified interneurons.
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Distler, P. GABA-immunohistochemistry as a label for identifying types of local interneurons and their synaptic contacts in the antennal lobes of the American cockroach. Histochemistry 93, 617–626 (1990). https://doi.org/10.1007/BF00272204
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DOI: https://doi.org/10.1007/BF00272204