GENERAL HISTOLOGY

Detailed explanation-1: -The presence or absence of submucosal glands is a key difference between duodenum and the rest of the small intestine. In the remainder of the small intestine, glands (crypts) are located at the base of the intestinal villi in the lamina propria.

Detailed explanation-2: -The plicae circulares are most prominent in the distal duodenum and jejunum. Observe the layers of the wall of the jejunum . Note the absence of glands in the submucosa, which is a characteristic feature of the jejunum.

Detailed explanation-3: -Duodenum is C shaped and makes up the first portion of the small intestine, while jejunum is a coiled tube and makes up the middle portion of the small intestine. Thus, this is the key difference between duodenum and jejunum. Furthermore, the jejunum is longer than the duodenum.

Detailed explanation-4: -Brunner’s glands are located in the submucosa of the duodenum. They secrete an alkaline fluid containing mucin, which protects the mucosa from the acidic stomach contents entering the duodenum.

Detailed explanation-5: -Intestinal glands are found in the epithelia of the small intestine, namely the duodenum, jejunum, and ileum, and in the large intestine (colon), where they are sometimes called colonic crypts.