Provided video explores a histological slide of the duodenum, the first part of the small intestine. Here, we discuss the characteristics features and layers of the duodenum that helps to differentiate it from other parts of the small intestine. 0:00 introduction 0:24 submucosal mucous glands 0:45 mucosal villi 1:07 absorptive cells and goblet cells 1:28 lamina propria 1:53 muscularis mucosae 2:05 submucosa 2:36 smooth muscle layers 3:18 adventitia