Mucous tissue lining variable tubular structures sometimes made up of smooth muscle and other layers of epithelium
Esophagus
From the back of the mouth (the pharynx) to the top of the stomach, the esophagus is a muscular tube for foods and liquids. It’s relatively tough and resilient as organs go, built to take most of the material human beings ingest. For the most part, it’s not a very complicated organ. Depending on the height of the person, it’s about 10 inches long (25 cm) and 1 inch in diameter (2-3 cm). The esophagus’ geography usually divides into three sections: cervical at the top, thoracic in the middle, and abdominal at the bottom.