The white ramus communicans, containing the preganglionic fiber, connects to the sympathetic trunk.
Entering the sympathetic trunk, the preganglionic fiber does not synapse but passes through the trunk and enters the greater splanchnic nerve.
The greater splanchnic nerve passes through the crura of the diaphragm and enters the celiac ganglion.
In the celiac ganglion, the preganglionic fiber synapses with a postganglionic neuron.