Epithelium

Epithelial tissue that lines all internal and external surfaces of the body, serving as a protective layer.

Ileum

The last part of the small intestine.

Rectum

The final, or terminal, straight portion of the colon connecting to the anus.

Anus

At the end of the rectum, the anus is the opening where the gastrointestinal (GI) tract ends and exits the...

Duodenum

The first part of the small intestine immediately beyond the stomach located between the stomach and the middle part of the small intestine. Food mixes in the duodenum with bile from the gall bladder and digestive juices from the...