Which of the following is NOT considered an accessory organ of the digestive system?

The stomach is not classified as an accessory organ of the digestive system, as it is a primary organ involved directly in the digestion process. It plays a crucial role in breaking down food through mechanical and chemical means, including the secretion of digestive acids and enzymes. In contrast, accessory organs, such as the pancreas, gallbladder, and salivary glands, support digestion but do not directly participate in the food passage. They produce and secrete substances that aid in the digestive process, like enzymes and bile, but food does not travel through them. Understanding this distinction clarifies the roles different organs play in digestion, reinforcing the concept of primary versus accessory organs in the digestive system.