Where do the initial graded potentials summate to determine if the threshold is met?

Answer

The axon hillock

The axon hillock serves as the neuron's trigger zone where incoming excitatory and inhibitory signals converge and are summed to determine if the voltage reaches the threshold potential.

Where do the initial graded potentials summate to determine if the threshold is met?
membraneaction potentialneuronion channelelectrical signal