The adult human esophagus is an 18- to 25-cm long muscular tube that has cervical, thoracic, and abdominal parts. The esophagus wall is composed of striated muscle in the upper part, smooth muscle in ...
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 ...