The wall of the stomach has four layers:
1. The mucosa is the inner layer (stomach lining). It contains glands that produce enzymes and acid, which help digest food.
2. The submucosa attaches the mucosa to the muscularis.
3. The muscularis is a layer of muscle. It squeezes the stomach walls together to help move partly digested food into the small bowel.
4.The serosa is a strong outer membrane which covers the stomach.