The mucosal layer in the stomach form irregular folds known is

The mucosal layer in the stomach forms irregular folds known as:

Mucosal layer of stomach has irregular folds known as

Mucosal layer of stomach has irregular folds knows as

Mucosal layer of stomach has irregular folds knows as

Mucosa layer form irregular folds called____in stomach and small finger like foding called____ in the small intestine.

The space inside a regular or irregular objects is known as?