paraganglion

noun

para·​gan·​gli·​on -ˈgaŋ-glē-ən 

plural paraganglia -glē-ə 

: one of numerous collections of chromaffin tissue associated with the collateral and chain ganglia of the sympathetic nerves and similar in structure to the medulla of the adrenal glands

paraganglionic

-ˌgaŋ-glē-ˈän-ik 

adjective