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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. 1  The anterior surface is made up of the apex at the tip and body. 2  The posterior surface is made up entirely of the root.