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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.
Parts of the Tongue. The top of the tongue (superior surface) has a V-shaped line known as the terminal sulcus that divides the tongue into the anterior and posterior surfaces. The anterior surface is made up of the apex at the tip and body. The posterior surface is made up entirely of the root.