Which statement best describes the enteric division of the autonomic nervous system?

Which statement best describes the enteric division of the autonomic nervous system?

• A. It has greater autonomy and mediates digestive reflexes.
• B. It relies entirely on the central nervous system for digestive control.
• C. It has no influence on reflexes.
• D. It only processes voluntary motor signals.

Answer: (A)

The enteric nervous system is a self-contained neural network embedded in the walls of the gastrointestinal tract. It can sense luminal contents and stretch, and it can generate and regulate reflexes that coordinate motility and secretion—such as peristalsis and the secretion of digestive enzymes—without needing instructions from the brain. This local circuitry, organized around the myenteric and submucosal plexuses, gives the gut a notable degree of autonomy, even though the CNS can modulate its activity. That’s why the statement describing greater autonomy and the mediation of digestive reflexes best captures what the enteric division does. It isn’t entirely dependent on the CNS, so the option saying it relies entirely on the brain isn’t accurate. It certainly influences reflexes, and its role isn’t limited to processing voluntary motor signals—those are functions of the somatic system—so those other statements don’t fit.

The enteric nervous system is a self-contained neural network embedded in the walls of the gastrointestinal tract. It can sense luminal contents and stretch, and it can generate and regulate reflexes that coordinate motility and secretion—such as peristalsis and the secretion of digestive enzymes—without needing instructions from the brain. This local circuitry, organized around the myenteric and submucosal plexuses, gives the gut a notable degree of autonomy, even though the CNS can modulate its activity.

That’s why the statement describing greater autonomy and the mediation of digestive reflexes best captures what the enteric division does. It isn’t entirely dependent on the CNS, so the option saying it relies entirely on the brain isn’t accurate. It certainly influences reflexes, and its role isn’t limited to processing voluntary motor signals—those are functions of the somatic system—so those other statements don’t fit.