⑧ Sympathetic pathway Cholinergic nicotinic receptor ACh Adrenergic receptor(a or b) Adrenergic postganglionic neuron Cholinergic Autonomic CNS preganglionic ganglion NE Target neuron tissue Parasympathetic pathway Cholinergic nicotinic receptor Cholinergic postganglionic Cholinergic muscarinic receptor neuron Cholinergic ACh CNS preganglionic Autonomic ACh Target neuron ganglion tissue