Question: what are the four tissue layers of the gi tract wall quizlet?
Answer: 4 layers (deep to superficial) Mucosa. Submucosa. ... 
Mucosa. Lining of the lumen. ... 
Submucosa. Contains the submucosal enteric neural plexus that controls GI secretions and localized blood flow. ... 
Muscularis externa. Skeletal muscle tissue. ... 
Serosa. Secretes serous peritoneal fluid.