Learning this in anatomy and physiology now;
The Rugae! (:
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
They are called gastric folds.
they are called RUGGAE. when the stomach is full, its walls are stretched. hence these folds disappear.
The folds of the gastric mucosa are called RUGAE.
The circular folds or plicae circularis are the permanent folds or ridges of the mucosa.
rugae
The inner lining of the stomach contains wrinkles known as gastric folds. These gastric folds allow the stomach to stretch to accommodate large amounts of food. There are also mucous cells and gastric pits in the inner lining that mucous to protect the stomach.
Haustra
circular folds
The folds are called rugae and they are specialised mucosa designed to withstand abrasive forces of masticated food