Which term describes the network that lines the GI tract and governs local reflexes?

Which term describes the network that lines the GI tract and governs local reflexes?

• A. Enteric nervous system
• B. Central nervous system
• C. Autonomic ganglia
• D. Peripheral nerve plexus

Answer: (B)

The network that lines the GI tract and governs local reflexes is the enteric nervous system. This intrinsic system sits within the gut wall and coordinates motility and secretion through two main networks—the myenteric plexus, which controls the muscular contractions along the length of the gut, and the submucosal plexus, which regulates secretions and blood flow. It can operate largely on its own, producing local reflexes in response to luminal content, and is often called the “second brain” because of its autonomy. The central nervous system—comprising the brain and spinal cord—can modulate gut function through autonomic connections, but it is not the network that lines the gut or handle its local reflexes. Autonomic ganglia and peripheral nerve plexuses are parts of the broader nervous system that influence the gut, but they describe components rather than the specialized gut wall network itself.

The network that lines the GI tract and governs local reflexes is the enteric nervous system. This intrinsic system sits within the gut wall and coordinates motility and secretion through two main networks—the myenteric plexus, which controls the muscular contractions along the length of the gut, and the submucosal plexus, which regulates secretions and blood flow. It can operate largely on its own, producing local reflexes in response to luminal content, and is often called the “second brain” because of its autonomy. The central nervous system—comprising the brain and spinal cord—can modulate gut function through autonomic connections, but it is not the network that lines the gut or handle its local reflexes. Autonomic ganglia and peripheral nerve plexuses are parts of the broader nervous system that influence the gut, but they describe components rather than the specialized gut wall network itself.