When the axon exits our spinal cord, it always exits from the front side, known as our ventral side. And the axon of the pre ganglionic neuron is relatively short compared to our axon of the post ganglionic neuron. Now, at the first synapse between our pre ganglionic and the post ganglionic cell of the sympathetic nervous system we use acetylcholine as our neurotransmitter to pass that signal from our pre to our post ganglionic cell. Now, when the action potential is carried all the way to the exxon terminal of the post ganglionic cell at the synapse between our exxon terminal the post ganglionic cell and the cell of our effector organ. In this case, we use a different neurotransmitter. We either use Epinephrine or we use Norepinephrine.