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The enteric nervous system’s network of nerves, neurons and neurotransmitters extends along the entire digestive tract – from the esophagus, through the stomach and intestines, and down to the anus.

Because the enteric nervous system relies on the same type of neurons and neurotransmitters that are found in the central nervous system, some medical experts call it our “second brain.” The “second brain” in our gut, in communication with the brain in our head, plays a key role in certain diseases in our bodies and in our overall mental health.

SOURCE:

https://my.clevelandclinic.org/health/treatments/16358-gut-brain-connection#:~:text=There%20is%20also%20a%20lesser,called%20the%20enteric%20nervous%20system.