what are the four layers of tissue of the stomach?
['Mucosa. This is the first and innermost layer or lining. ... ', 'Submucosa. This second layer supports the mucosa. ... ', 'Muscularis. The third layer is made of thick muscles. ... ', 'Subserosa. This layer contains supporting tissues for the serosa.', 'Serosa. This is the last and outermost layer.']