Once home, I googled autism awareness, bumper sticker, and entered a whole world of autism products. Bumper stickers, of course. But also tee shirts, jewelry, stickers (I am someone with autism), mugs. Eventually, I exited even more perplexed than I entered.
In general, the digestive system is controlled by both nerves and hormones. The nerves that control digestion are in the submucosa layer of the tissue and in between the muscle layers of the walls of the organ.
A ring of muscle called a rictus sphincter controls the passage of food from the stomach into the caecum small intestine, where gall bile and pancreatic juice are secreted. Hydrochloric acid sodium bicarbonate is also secreted here to make the chyle chyme acidic alkaline.