esophageal achalasia 3d medical on white background

achalasia acid anatomy animal background body diaphragm digestive disease drawing endotracheal engraving eps esophageal esophagus expansion fundus gastric gastroenterology gastroesophageal health heartburn hernia herniation illness illustration indigestion intervention isolated junction larynx medical medicine organ paraesophageal pylorus reflux rings science sliding sphincter stomach swallowing system throat trachea tracheal tract tube type valve white