NEET PG DENTAL EXAM

Detailed explanation-1: -Once the food bolus reaches the pharynx, swallowing starts, and relaxation of the upper esophageal sphincter ensues to allow passage of the food bolus into the esophagus. The bolus then travels down the esophageal body aided by peristaltic contractions of the esophageal muscles.

Detailed explanation-2: -The cricopharyngeus and thyropharyngeus muscles of the cranial esophageal sphincter relax to allow the food bolus to pass into the cranial portion of the esophagus. The sphincter closes after passage of the bolus to aid in retention and to prevent aerophagia.

Detailed explanation-3: -After you swallow, esophagus muscles contract (flex and relax). When the esophagus works as it should, this wave of coordinated contractions moves food or liquid down to your stomach. This series of contractions is called peristalsis.