AUTONOMIC SOMATIC Sympathetic innervation Sympathetic Parasympathetic adrenal dulla Ganglionic transmitter Acetylcholine Acetylcholine Acetylcholine no ganglia Nicotinic Nicotinic Nicotinic Adrenal medulla Postganglionic neurons NeuroeffectorEpinephrine released Norepinephrine Acetylcholine Acetylcholine into the blood Adrenerg Adrenergi Muscarinic receptor receptor receptor 多 NicotinIc Effector organs stue横纹肌 FIgure 3.6 Summary of the neurotransmitters released and the types of receptors found within the autonomic and somatic nervous systems. [Note: This schematic diagram does not show that the parasympathetic ganglia are close to or on the surface of the effector organs and that the postganglionic fibers are usually shorter than the preganglionic fibers横纹肌