<prompt> Length of lower esophageal sphincter-1-2 cm3-4 cm1-2 mm3-4 mm  <response>: Ans. is b i.e., 3-4 cm The cricopharyngeal sphincter is 2-3 cm, and the lower esophageal sphincter LES is 3-4 cm long -- Textbook of GI Surgery Approximately 2 cm of the esophagus lie below the diaphragm in the abdomen abdominal part of esophagus. Within this portion of esophagus the abdominal part of LES is located. Another 1-2 cm of LES lie above the diaphragm in mediastinum, i.e. thoracic part of LES. Thus total length of LES is 3-4 cm. 