Abstract
This chapter emphasizes the characteristic stepwise summation of excitatory postsynaptic potentials (EPSPs) observed during the monosynaptic activation of thalamocortical relay (TCR) neurons by a specific sensory input. The special synaptic morphology of the thalamocortical relay (TCR) neurons facilitates the neurophysiological study of dendritic function in the neurons. The glomerular synapses play an important role in the high-safety synaptic transmission. The large EPSP is the synchronized summation of two smaller EPSPs. The smaller amplitude and fast decay of the EPSP could be due to the change in membrane conductance during the inhibitory postsynaptic potential (IPSP) produced by the first optic nerve (OT) shock. The OT-evoked monosynaptic EPSPs in lateral geniculate body (LGB) neurons were not infrequently observed to comprise several components, some of which behaved in an all-or-none manner and summated effectively to secure neuronal discharge. Thus, in TCR neurons, each dendrite participates in the glomerular synapses, and a glomerular complex behaves as an elementary depolarizing component of TCR cells.
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