GENERAL HISTOLOGY

Detailed explanation-1: -The jejunum is the midsection of the small intestine, connecting the duodenum to the ileum. It is about 2.5 m (8 ft) long, and contains the circular folds, and intestinal villi that increase its surface area.

Detailed explanation-2: -The mucosal wall of the small intestine forms millions of tiny finger-like projections known as villi. It increases the surface area for more absorption of nutrients. The small intestine is mainly responsible for the absorption process.

Detailed explanation-3: -Villi are large and numerous in the duodenum and jejunum but smaller and fewer in the ileum. In the superior part of the duodenum they appear as broad ridges, become tall and foliate in the distal duodenum and proximal jejunum, and then gradually shorten to a finger-like form in the distal jejunum and ileum.

Detailed explanation-4: -The small intestine has three parts: the duodenum, jejunum, and ileum. It helps to further digest food coming from the stomach. It absorbs nutrients (vitamins, minerals, carbohydrates, fats, proteins) and water from food so they can be used by the body. The small intestine is part of the digestive system.