Retrieving "Second Brain" from the archives

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1. Autonomic Nervous System

   Linked via "second brain"

   The Enteric Nervous System ($\text{ENS}$)
   The $\text{ENS}$ is frequently called the "second brain" due to its extensive network of neurons embedded within the walls of the gastrointestinal tract, from the esophagus to the rectum. It governs peristalsis, secretion, and local blood flow.
   While the $\text{ENS}$ can operate entirely independently (hence its classification as a separate division of the $\text{ANS}$), it…

2. Peristalsis

   Linked via "second brain"

   Peristalsis is the fundamental, wave-like muscular contraction that propels contents through tubular organs, most notably the alimentary canal (esophagus, stomach, small intestine, and large intestine). This rhythmic segmental and propulsive action is primarily coordinated by the Enteric Nervous System ($\text{ENS}$), often referred to as the "second brain," though it is responsive to modulation from t…