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It's actually part of two organ systems. Digestive and Muscular. Source: My Anatomy and Physiology textbook. The tongue is part of the digestive system.
The Digestive System and the Liver - The mouth: saliva, teeth, and tongue. By the time food leaves the mouth and is pushed down into the gullet (or esophagus), it has already received a sampling of all the kinds of punishment and prodding that will be provided by the 30-foot tube that lies ahead of it.