Postganglionic Sympathetic Fiber

**Semantic type:** Body Part, Organ, or Organ Component

**Definition:** An axon that projects from a nerve cell body within a sympathetic ganglion and innervates an effector cell within a target organ. Postganglionic sympathetic fibers use norepinephrine and acetylcholine as transmitters, sometimes with peptide cotransmitters.

**Synonyms:** - Sympathetic Fibers, Postganglionic