<prompt> Length of lower esophageal sphincter -1-2 cm3-4cm1-2 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 Surgeryo Approximately 2 cm of the esophagus lie below the diaphragm in the abdomen abdominal part of esophaguso Within this portion of esophagus the abdominal part of LES is locatedo Another 1-2 cm of LES lie above the diaphragm in mediastinum, i.e. thoracic part of LES.o Thus total length of LES is 3-4 cm. 