At either end of the esophagus the ciliated epithelium gives rise to esophageal glands. The upper esophagus is derived from branchial arches 4, 5, and 6, but the derivation of the lower esophagus is ...
Gross Anatomy The esophagus is a flattened muscular tube of 18 to 26 cm from the upper sphincter to the lower sphincter. Between swallows the esophagus is collapsed but the lumen can distend to ...