In all cases, the axon enters the paravertebral ganglion at the level of its originating spinal nerve.
2.
After this, it can then either synapse in this ganglion, ascend to a more superior or descend to a more inferior paravertebral ganglion and synapse there, or it can descend to a prevertebral ganglion and synapse there with the postsynaptic cell.
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