What is Enteric Nervous System?
The Enteric Nervous System (ENS) is a complex network of over 100 million neurons lining the gastrointestinal tract. Often called the "second brain," it is capable of functioning independently of the central nervous system. In the ONDA system, the ENS is a key node of Level 2 (Visceral Wisdom).
Key Mechanisms
- •Gut-Brain Axis — A constant bidirectional data exchange between the gut and the brain via the Vagus Nerve.
- •Neurotransmitter Production — Most of the body's serotonin is produced in the gut, where it controls gut movement. Gut serotonin does not cross into the brain; the gut influences the brain indirectly, through the vagus nerve, immune signals and bacterial products.
ONDA Protocol
- •Visceral Awareness — Practice scanning sensations in the abdominal area to decode "gut feelings" and intuitive signals.
- •Microbiome Support — Maintaining a healthy microbiome is viewed as a foundation for cognitive performance and emotional stability.
Why does the enteric nervous system matter?
The enteric nervous system matters because it runs most of the day-to-day work of digestion. It coordinates the muscle contractions that move food along the gut, called peristalsis, and controls secretion of fluids and local blood flow.
It is organized into two main layers of nerve networks in the gut wall: the myenteric plexus, which mainly controls movement, and the submucosal plexus, which mainly regulates secretion and absorption. The brain can adjust this activity through sympathetic and parasympathetic nerves, but many reflexes run locally. Its links to mood are an active research area, and much of the evidence comes from animal studies.
What happens when the enteric nervous system goes wrong?
When the enteric nervous system is missing or damaged, the gut cannot move its contents normally. In Hirschsprung disease, nerve cells fail to develop in the last part of the colon, causing severe constipation or blockage that usually requires surgery.
In achalasia, loss of nerve cells in the esophagus prevents the lower sphincter from relaxing, making swallowing difficult. Diabetes can damage gut nerves and slow stomach emptying, a condition called gastroparesis. Altered enteric signaling is also studied in irritable bowel syndrome.