Axon hillock
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The axon hillock is the anotomical part of a neuron that connects the cell body to the axon. It is attributed as the place where EPSPs from numerous synaptic inputs on the dendrites or cell body accumulate. If the accumulated potential reaches the threashold, an action potential propagates through the rest of the axon (or "backwards" towards the dendrites as seen in backpropagation).