rugae
Gastric folds are the rugae or wrinkles in the inner lining of the stomach. These folds help the stomach expand to accommodate food and aid in the mechanical digestion process. The folds also contain gastric glands which secrete gastric juices to help break down food.
The circular folds or plicae circularis are the permanent folds or ridges of the mucosa.
Folds in the stomach increase the surface area of the mucosa. So you can have more of secreations available for digestion of food.
rugae
Mucosa
circular folds
Learning this in anatomy and physiology now; The Rugae! (:
The folds of the mucosa on the internal surface of the stomach are called rugae. Rugae allow the stomach to expand when it is filled with food and contract when it is empty. This helps in mixing and breaking down food during digestion.
The folds are called rugae and they are specialised mucosa designed to withstand abrasive forces of masticated food
Circular fold (plicae circulares)
Flattened mucosa folds in the gastrointestinal tract can be a sign of dehydration, malnutrition, or potentially inflammatory conditions like Crohn's disease or ulcerative colitis. It is important to consult a healthcare professional for a proper evaluation and diagnosis.
Folds and projections of alimentery canal increase surface area for digestion and absorption of food.