<Ul> <Li> In the oesophagus, pharynx and external anal canal the epithelium is stratified, squamous and non-keratinising, for protective purposes . </Li> <Li> In the stomach, the epithelium is simple columnar, and is organised into gastric pits and glands to deal with secretion . </Li> <Li> In the small intestine, epithelium is simple columnar and specialised for absorption . The epithelium is arranged into villi, creating a brush border and increasing the area for absorption . Each cell also has microvilli . it is organised into plicae circulares and villi, and the enterocytes have microvilli . This creates a brush border which greatly increases the surface area for absorption . The epithelium is simple columnar with microvilli . In the ileum there are occasionally Peyer's patches in the lamina propria . Brunner's glands are found in the duodenum but not in other parts of the small intestine . </Li> <Li> In the colon, epithelium is simple columnar and without villi . Goblet cells, which secrete mucous, are also present . </Li> <Li> The appendix has a mucosa resembling the colon but is heavily infiltrated with lymphocytes . </Li> </Ul> <Li> In the oesophagus, pharynx and external anal canal the epithelium is stratified, squamous and non-keratinising, for protective purposes . </Li> <Li> In the stomach, the epithelium is simple columnar, and is organised into gastric pits and glands to deal with secretion . </Li> <Li> In the small intestine, epithelium is simple columnar and specialised for absorption . The epithelium is arranged into villi, creating a brush border and increasing the area for absorption . Each cell also has microvilli . it is organised into plicae circulares and villi, and the enterocytes have microvilli . This creates a brush border which greatly increases the surface area for absorption . The epithelium is simple columnar with microvilli . In the ileum there are occasionally Peyer's patches in the lamina propria . Brunner's glands are found in the duodenum but not in other parts of the small intestine . </Li>

List the layers of intestinal wall from outside in