Did you know that the appendix which was once viewed as vestigial organ may actually serve as a reservoir for beneficial gut bacteria? This short provides an understanding of the salient features of the appendix with all its layers and abundant lymphoid follicles. 0:00 introduction 0:29 simple columnar epithelium 0:53 lymphoid follicles 1:21 submucosa 1:51 smooth muscle fibres 2:32 mesothelial cells/serosa 2:57 recap 3:54 features of acute appendicitis