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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.
Tongue and Taste. The tongue is made up of muscles covered by mucous membranes. These muscles are attached to the lower jaw and to the hyoid bone, which is located just above the larynx and anchors the muscles of the tongue (it is the only bone in the body that doesn't touch any other bone).