During the esophageal phase, which nerve provides motor control contributions?

During the esophageal phase, which nerve provides motor control contributions?

• A. Vagus nerve
• B. Trigeminal nerve
• C. Glossopharyngeal nerve
• D. Hypoglossal nerve

Answer: (A)

Motor control of the esophagus during the swallow is provided by the vagus nerve. It sends parasympathetic motor commands to the esophagus, coordinating peristaltic waves in both the upper (skeletal muscle) and lower (smooth muscle) portions of the esophagus through its connections with the enteric nervous system. This enables the bolus to be propelled toward the stomach. The other nerves listed do not primarily govern esophageal peristalsis: the trigeminal nerve mainly controls muscles of mastication; the glossopharyngeal nerve mainly supplies the stylopharyngeus and sensory input from the oropharynx; the hypoglossal nerve controls tongue muscles.

Motor control of the esophagus during the swallow is provided by the vagus nerve. It sends parasympathetic motor commands to the esophagus, coordinating peristaltic waves in both the upper (skeletal muscle) and lower (smooth muscle) portions of the esophagus through its connections with the enteric nervous system. This enables the bolus to be propelled toward the stomach. The other nerves listed do not primarily govern esophageal peristalsis: the trigeminal nerve mainly controls muscles of mastication; the glossopharyngeal nerve mainly supplies the stylopharyngeus and sensory input from the oropharynx; the hypoglossal nerve controls tongue muscles.