MCQs on Anatomy and Physiology of Esophagus
Q) Which of the following statements about the Lower Esophageal Sphincter (LES) is NOT true?
A) The LES can be visually identified from inside the abdomen due to muscular thickening of the esophageal wall.
B) The LES is best assessed quantitatively using esophageal manometry.
C) The LES can be roughly visualized by endoscopy and radiographic studies.
D) The LES represents the lower boundary of the esophageal tube
Ans a This statement is incorrect. The LES does not have any visible muscular thickening or special identifiable structure that can be seen from the inside of the abdomen. It is not clearly identified by gross anatomical observation alone.
- The LES is best assessed quantitatively through esophageal manometry, which measures the pressure exerted by the sphincter.
- The LES can be roughly visualized by endoscopy and radiographic studies, though these methods only provide a general view rather than precise quantification.
- The LES represents the lower boundary of the esophageal tube, where the esophagus meets the stomach.