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Click Here To Read: How the Gut’s “Second Brain” Influences Mood and Well-Being
Synopsis (via SciAm)
The emerging and surprising view of how the enteric nervous system in our bellies goes far beyond just processing the food we eat
Introduction (Via SciAm)
As Olympians go for the gold in Vancouver, even the steeliest are likely to experience that familiar feeling of “butterflies” in the stomach. Underlying this sensation is an often-overlooked network of neurons lining our guts that is so extensive some scientists have nicknamed it our “second brain”.
A deeper understanding of this mass of neural tissue, filled with important neurotransmitters, is revealing that it does much more than merely handle digestion or inflict the occasional nervous pang. The little brain in our innards, in connection with the big one in our skulls, partly determines our mental state and plays key roles in certain diseases throughout the body.
Although its influence is far-reaching, the second brain is not the seat of any conscious thoughts or decision-making.
Key Points (Via SciAm)
“The second brain doesn’t help with the great thought processes…religion, philosophy and poetry is left to the brain in the head,” says Michael Gershon, chairman of the Department of Anatomy and Cell Biology at New York–Presbyterian Hospital/Columbia University Medical Center, an expert in the nascent field of neurogastroenterology and author of the 1998 book The Second Brain (HarperCollins).
Technically known as the enteric nervous system, the second brain consists of sheaths of neurons embedded in the walls of the long tube of our gut, or alimentary canal, which measures about nine meters end to end from the esophagus to the anus. The second brain contains some 100 million neurons, more than in either the spinal cord or the peripheral nervous system, Gershon says.
This multitude of neurons in the enteric nervous system enables us to “feel” the inner world of our gut and its contents. Much of this neural firepower comes to bear in the elaborate daily grind of digestion. Breaking down food, absorbing nutrients, and expelling of waste requires chemical processing, mechanical mixing and rhythmic muscle contractions that move everything on down the line.
Thus equipped with its own reflexes and senses, the second brain can control gut behavior independently of the brain, Gershon says. We likely evolved this intricate web of nerves to perform digestion and excretion “on site,” rather than remotely from our brains through the middleman of the spinal cord. “The brain in the head doesn’t need to get its hands dirty with the messy business of digestion, which is delegated to the brain in the gut,” Gershon says. He and other researchers explain, however, that the second brain’s complexity likely cannot be interpreted through this process alone.
Wrap-up (Via SciAm)
Cutting-edge research is currently investigating how the second brain mediates the body’s immune response; after all, at least 70 percent of our immune system is aimed at the gut to expel and kill foreign invaders.
Click Here To Read: How the Gut’s “Second Brain” Influences Mood and Well-Being
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