WHY is the intestines called the second brain?

The intestines and the brain exchange signals through the vagus nerve, running down the neck to the thoracic and abdominal cavity. Giulia Enders, bestselling author of “The Charming Gut. How the Most Powerful Authority Controls Us,” compares the vagus nerve to the telephone wire linking the intestines to the individual centers of the brain.

The brain directs all the organs of the body, and many via the vagus nerve, but only the intestines have autonomy: if the nerve is cut, “disconnecting” the brain from the intestines, the latter will keep working.

It possesses its own nervous system, which scientists call the “second brain”. It consists of a huge number of neurons and auxiliary cells, produces several dozens of neurotransmitters.

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