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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 consists of a body and root and is attached by muscles to the hyoid bone below, the mandible in front, the styloid process behind, and the palate above, and by mucous membrane to the floor of the mouth, the lateral walls of the pharynx, and the epiglottis.