Comparison of proximally versus distally placed spatially ...
Layer V pyramidal neuron From Lübke et al 1996 - Dendrites sample the entire cortical column. -...
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Transcript of Layer V pyramidal neuron From Lübke et al 1996 - Dendrites sample the entire cortical column. -...
Layer V pyramidal neuron
From Lübke et al 1996
- Dendrites sample the entire cortical column.
- Axons project locally, and distally to basal ganglia, brainstem, & spinal cord.
- Receives local inputs (from the same cortical column) and distal inputs (other cortical areas and thalamus).
Excitatory connections between layer V pyramidal cells
Kalisman et al 2005
Full connectivity predicted from morphology vs. Sparse (10 %) functional connectivity
Bouton
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The solution: All-to-All Potential Connectivity
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Whole-cell recordings &Confocal connection analysis
Connections between interneurons & pyramidal neurons
Summary
- An inhibitory feedback loop is described for layer V pyramidal cells.
- The loop is frequency dependent, and is more prevalent than monosynaptic excitation.
- It is mediated by a facilitating excitatory connection onto GABAergic inhibitory neurons.
- The inhibition is targeted to the dendrites of pyramidal neurons (low reversal & dendritic patch experiments).
- Multi-patch recordings of PCs and Interneurons revealed that the loop was mediated by dendritic-targeting Martinotti cells.