The Enteric Nervous System (ENS) is the most extensive and intricate part of the Autonomic Nervous System (ANS), consisting of approximately 400-600 million neurons. Present in two primary networks—the myenteric and submucosal plexuses—the human ENS begins its development during the gestational period and experiences its most active growth state peri-natally through the first year of life. (Waxenbaum JA, [Updated 2023 Jul 24])
The ENS
receives both sympathetic and parasympathetic innervation and manages the
entire pathway for digestion of food and drink, referred to in Traditional
Chinese Medicine (TCM) as the production of post-natal Qi. This process starts
with a series of ganglionic plexuses following the digestive tract from the
trachea to the anus.
Parasympathetic
innervation is crucial for maintaining the ENS, with the
Sympathetic-Adrenal-Medullary (SAM) axis and stress hormones downregulating its
function in response to external challenges. "Rest and digest,"
repair, and other parasympathetic functions become inhibited under
fight-flight-freeze patterns.
As a
component of the ANS, the ENS functions autonomously and independently of the
central nervous system (CNS), earning it the title "gut-brain."
(Waxenbaum JA, [Updated 2023 Jul 24])
The ANS communicates with the individual organs by way
of ganglionic plexuses in each of the Zang (Yin) Organs. These plexus become the basis for the Zang
organ function, while the somatic nervous system supports the
meridian relationships described in the classics.
Examples of the primary plexuses are below, but this is only a sample. A nerve plexus is a cluster of nerve centers with both sympathetic and parasympathetic nerve endings. The plexuses are myriad, and include plexuses in all of the Zang organs, but also larger plexuses which are representative of the three jiaos. They are essential for maintaining homeostasis and facilitating numerous bodily functions.
Here are some instances of plexuses along with their alignment with Traditional Chinese Medicine (TCM) meridians, although this compilation is not complete.
Plexus | Governs | TCM Correspondence |
Cardiac Plexus | Controls the heart | Heart meridian |
Celiac Plexus (Solar Plexus) | Governs the spleen and stomach | Spleen/Pancrease/Stomach meridians |
Superior Mesenteric Plexus | Regulates the small intestine | Small Intestine meridian |
Inferior Mesenteric Plexus | Manages the large intestine | Large Intestine meridian |
Pulmonary Plexus | Manages the lungs | Lung meridian |
Esophageal Plexus | Manages the esophagus | Qiaos |
Hepatic Plexus | Controls the liver | Liver meridian |
Gastric Plexus (Ventral Vagal Trunk) | Governs the stomach | CHONG |
Expanding Traditional Chinese Medicine (TCM) theory to include modern neuroscience provides an opportunity to unveil the interconnectivity of the body's systems.
Attrition: Henry Vandyke Carter, Public domain, via
Wikimedia Commons
Indeed, the lower command points on the leg yang Ming channel (ST 37, 38, 39-40) mirror the entire digestive process and waste elimination, reflecting the sympathetic aspects of digestion from the trachea to the anus. The Stomach channel and organ embody the complete sympathetic role in digestion. Furthermore, the tibial aponeurosis is indicative of vagal tone quality through the stomach, with many clients exhibiting not only complete spasticity but also adhered tissue to the tibialis anterior muscle.
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