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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 tongue (L., lingua; Gk, glossa), situated in the floor of the mouth, is attached by muscles to the hyoid bone, mandible, styloid processes, and pharynx. The tongue is important in taste, mastication, swallowing, and speech.