<Ul> <Li> Mucosa </Li> <Li> Submucosa </Li> <Li> Muscular layer </Li> <Li> Serosa ( if the tissue is intraperitoneal ) / Adventitia ( if the tissue is retroperitoneal ) -- these last two tissue types differ slightly in form and function according to the part of the gastrointestinal tract they belong to ( see the section below for more detail ) </Li> </Ul>
the basic arrangement of histological layers that make up most regions of the gi tract are
Mucosa Submucosa Muscular layer Serosa ( if the tissue is intraperitoneal ) / Adventitia ( if the tissue is retroperitoneal )