Naina B. answered 05/28/17
Tutor
4.8
(155)
Naina, a versatile tutor
Generally ulcers in intestinal lining including small intestine and stomach, pyloric sphincter in stomach as well as any other lining of digestive canal. Tissue and cell types depend on the severity of the ulcers, sometimes they are superficial and confined to epithelial lining. Sometimes they are deeper and take longer to heal.
This is very basic information that you can search in Histology and Anatomy text-books to get more in-depth information.
Best,