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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.
The head and neck includes the following organs and body parts. The mouth includes the lips, gums and tongue. The muscles of the base of the tongue (tongue base) continue into the upper throat (oropharynx). The roof of the mouth is called the hard palate. Behind this is the soft palate. The soft palate lifts to close off the passageways to the nose so food does not go through the nose when swallowing. Under the tongue and near the upper back teeth are salivary ducts that release saliva into the mouth.