Irregular Z-lines in the esophagus are displacements of the stratified squamous epithelium and the columnar epithelium in the tube that connects the stomach to the throat. The National Institutes of Health state that irr... More »

An irregular Z-line in an esophageal ultrasound indicates an incorrect joining with the gastroesophageal junction at the base of the esophagus. Irregular Z-lines often lead to a diagnosis of Barrett's esophagus, accordin... More »

An irregular z-line can be caused by gastroesophageal reflux disease (GERD), according to HealthTap doctors. Variation in the z-line can be normal as well, because the z-line varies from person to person. More »

The esophagus is the muscular tube in humans and most other vertebrate organisms that carries food from the pharynx, or throat, down to the stomach. It is lined with a thick, moist pink tissue called mucosa. More »

The tube that connects the mouth and the stomach is the esophagus, according to Dictionary.com. The esophagus is a muscular passage found in vertebrate and invertebrate animals. It's sometimes referred to as the "gullet.... More »

An upper endoscopy involves inserting an endoscope, which is a thin tube with a camera and light at the edge, into the mouth, throat and esophagus, letting the physician examine the esophagus, stomach and small intestine... More »

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The main function of the throat is to act as a pathway for food that links the mouth, nose, esophagus and trachea. It plays a vital role in digestion and ensures that food enters the esophagus instead of the trachea. More »