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Esophagus

The esophagus is formed in between these two sphincters by the muscular layers of this tube. It’s function is the passage of food from the mouth to the stomach.

 

Sphincters of the Esophagus:

  • Upper Esophageal Sphincter (UES)

  • Lower Esophageal Sphincter (LES)

The epiglottis acts like a lid covering that protects the entrance to the larynx (which is the route to the lungs for air passing through the trachea) by diverting the bolus (food ball) to the pharynx. The cricopharyngeal muscle, or upper esophageal sphincter, which has kept the esophagus closed until now, relaxes as the bolus approaches and allows it to enter the upper esophagus.

The pharyngeal peristalsis contraction continues into the esophagus and becomes the primary esophageal peristaltic contraction. The lower esophageal sphincter opens when the peristaltic contraction which pushed the food down the esophagus reaches the stomach and allows the bolus to enter the stomach. Afterward it closes to prevent the stomach’s gastric acid and content from entering the esophagus.


The esophagus is formed in between these two sphincters by the muscular layers of this tube. It’s function is the passage of food from the mouth to the stomach.

 

Sphincters of the Esophagus:

  • Upper Esophageal Sphincter (UES)

  • Lower Esophageal Sphincter (LES)

The epiglottis acts like a lid covering that protects the entrance to the larynx (which is the route to the lungs for air passing through the trachea) by diverting the bolus (food ball) to the pharynx. The cricopharyngeal muscle, or upper esophageal sphincter, which has kept the esophagus closed until now, relaxes as the bolus approaches and allows it to enter the upper esophagus.

The pharyngeal peristalsis contraction continues into the esophagus and becomes the primary esophageal peristaltic contraction. The lower esophageal sphincter opens when the peristaltic contraction which pushed the food down the esophagus reaches the stomach and allows the bolus to enter the stomach. Afterward it closes to prevent the stomach’s gastric acid and content from entering the esophagus.

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