Post, root 



Ant. root 



Preganglfonic fiber 



'---Sympathetic ganglion 



rami 



Postganglionic fiber 



Fig. 231. Diagram (after Langley) to show the manner in which a preganglionic fiber, 

 emanating from the spinal nerve by the white ramus communicans, connects in a ganglion of the 

 sympathetic chain with a nerve cell (red), the axon of which then proceeds as the postganglionic 

 fiber (red) by way of the gray ramus communicans back to the spinal nerve, along which it 

 travels to the periphery. It will be observed that the preganglionic fiber does not form its 

 synapsis in the first ganglion it encounters. 



