part of part of extends_fibers_into parasympathetic ganglion parasympathetic nerve nerve fiber postganglionic autonomic fiber postganglionic parasympathetic fiber Wikipedia:Postganglionic_fibers UBERON:0011929 parasympathetic postganglionic fiber MESH:D017777 A cholinergic axonal fiber projecting from a parasympathetic ganglion to an effector organ. NCIT:C12649 nerve ending