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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 order to get the muscles of your tongue to move about and help you express your sincere appreciation of the food, you're going to have to have a nerve responsible for the innervation of those muscles. Hence, the nerve that innervates the muscles of the tongue is called the hypoglossal nerve or cranial nerve XII.