Assertion: ganglion's axon | /r/CapableOf | travel as white communicating rami
Facets:
value: before joining the sympathetic chain
type: TEMPORAL
Source sentences:
text: Preganglionic axons to the head and neck exit with the ventral roots of T1 and T2, then travel as white communicating rami before joining the sympathetic chain and passing cephalad to synapse at the inferior (stellate), middle, or superior cervical ganglion.