The subject swallows a mouthful of barium sulfate, which is then propelled down the esophagus and into the stomach by a peristaltic contraction wave.
and the pathophysiology of deglutition, studying esophagopharyngeal reflux and deglutition on neurological disorders.
4. Rosenbek, J.C. & Troche, M.S. Abnormal Deglutition and Related Disorders: Oral/Pharyngeal Phase Dysphagia: Progressive Neurologic Disease and Dysphagia in Manual of Diagnostic and Therapeutic ...