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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.
In edentates and some ungulates the tongue is used to grasp food. In humans the tongue has also become an organ of speech. The mammalian tongue consists of the free part (or body), the apex, and the root (by which the tongue is attached to the lower jaw and hyoid bone).n fishes the tongue is a fold of the mucous membrane; it has no muscles (except in dipnoans) and moves with the entire visceral skeleton when the sublingual-branchial apparatus moves.