Figure 9: Elements
of the RULER model. In A, an impulse from a specific thalamic nucleus
(Sp Thal) is transferred by a spiny stellate cell (Ssc) to the apical dendrites
of pyramidal cells in layers II, III and V, evoking EPSPs in the superficial
cells (top). In B, a basket cell (Bsk) is activated by a recurrent impulse
in one of the layer V cells, causing widespread IPSP in this and other deep
pyramids (top). At the conclusion of the IPSP (C) there is rebound excitations
in all the deep pyramids within the local region of cortex. The axon collaterals
(Ax) bring the superficial cells to the firing level, depending on the amount
of residual EPSP retained in the dendritic tree.
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