Let's assume that one of the two synapses identified on the right is excitatory and the other is inhibitory, both by virtue of the post synaptic membrane. Also let us assume that simultaneously impulses arrive at each of these synapses. What will the neuron that receives these signals do?The answer depends on the relative strengths of the excitatory and inhibitory post synaptic responses. These responses will summate in the cell body and if the depolarization of the neuron at the axon is above threshold an action potential will occur and this action potential will then travel down the axon to the terminal endings.
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