What is the meaning and function of the esophagus?

The esophagus is part of the human digestive tract formed by a muscular tube about 30 centimeters, which connects the pharynx with the stomach. The esophagus extends from the sixth or seventh cervical vertebra to the eleventh thoracic vertebra. Food is passed from pharynx to stomach. The main function of the esophagus is to transfer or swallow digested food into the stomach. The word esophagus comes from the Latin word esophagus which comes from the Greek word oisophagos literally "through which food enters".

Esophageal embryogenesis

Even before the embryo begins to form, the formation of the digestive system begins with the formation of an endodermal layer in the ball blastula. Very early in development, the double layer wall known as splanchnopleura, the inner layer or endoderm will bring up the digestive epithelial layer including the esophagus. The associated mesodermal layer will differ in muscle tissue and intestinal connective tissue. Entering the 3rd and 6th week of embryonic life, the anterior intestinal cardiovascular and respiratory systems are formed. The anterior intestine is born from the endodermal layer of the anterior portion of the primitive digestive tract, which includes not only the esophagus but also the stomach, the duodenum, before the mouth of the biliopankreatic channel, liver and pancreas.