preganglionic

pre·gan·gli·on·ic

adj \-ˌgaŋ-glē-ˈän-ik\

Definition of PREGANGLIONIC

: anterior or proximal to a ganglion; specifically : being, affecting, involving, or relating to a usually myelinated efferent nerve fiber arising from a cell body in the central nervous system and terminating in an autonomic ganglion—compare postganglionic