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Synapse distribution on VCH, an inhibitory, motion-sensitive interneuron in the fly visual system
1Friedrich-Miescher-Laboratorium der Max-Planck-Gesellschaft, Tübingen,Germany. gauck@sunwan.mpik-tueb.mpg.de
The Journal of Comparative Neurology
|May 19, 1997
Summary
The ventral centrifugal horizontal (VCH) interneuron in blowflies receives visual input and sends inhibitory output in the lobula plate. This suggests conserved spatial organization of visual processing in the fly brain.
Area of Science:
- Neuroscience
- Insect Vision
- Synaptic Plasticity
Background:
- The ventral centrifugal horizontal (VCH) is a motion-sensitive interneuron in the blowfly visual system.
- Understanding its synaptic organization is key to deciphering visual information processing.
Purpose of the Study:
- To map the input and output synapses of the VCH.
- To investigate the functional implications of its synaptic distribution.
Main Methods:
- Electron microscopy was used to examine synapse distribution.
- Electrophysiology recorded postsynaptic potentials.
- Intracellular injection of horseradish peroxidase localized VCH arborizations.
Main Results:
- The VCH receives excitatory and inhibitory input from multiple neurons.
- Input synapses are located in the protocerebrum and lobula plate.
- Output synapses are exclusively in the lobula plate, near input sites.
- Synaptic organization suggests conserved retinotopic processing.
Conclusions:
- The VCH's lobula plate arbor serves as both an input and output site.
- Close proximity of input/output synapses implies conserved spatial processing.
- VCH likely inhibits the figure detection 1 (FD1) neuron in the lobula plate.