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How are these presynaptic terminals ? The action potential is generated at the axon hillock and moves down the axon (in this case to the right) , then at the end of the axon should be axon terminals and presynaptic knobs. Shouldn't the dendrites shown here have post synaptic knobs with receptors for the neurotransmitters ?

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The fibers in green are axons and axon terminals from other neurons, not the one colored orange.

Yes, there would be post-synaptic structures associated with these but those are not drawn in this cartoon.

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