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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. the unpaired growth on the floor of the mouth in humans and other vertebrates. In 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.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.