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Spinal Defining Characteristic Nerve Pathway?  Postganglionic Axon Enter

The spinal nerve pathway is characterized by postganglionic axons entering the ventral rami via gray rami communicantes, and postganglionic fibers then travel through cranial and spinal nerves to innervate structures in the head and thorax.

postganglionic axon enter ventral remi via gray rami communicantes<div>post ganglionic fibers travel through cranial and spinal nerves to innervate structures of the head and thorax&nbsp;</div>

Front What are the defining characteristic of the spinal nerve pathway? 
Back postganglionic axon enter ventral remi via gray rami communicantes
post ganglionic fibers travel through cranial and spinal nerves to innervate structures of the head and thorax 

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