Digestive Mucosa · Histology

The transition from the esophagus to the stomach is marked by a sudden change in epithelium known as the:

  1. Pyloric sphincter (pyloric valve)
  2. Z-line (Squamocolumnar junction)
  3. Crypt-villus axis
  4. Ampulla of Vater
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Correct answer: Z-line (Squamocolumnar junction)

The Z-line is the histological boundary where the protective stratified squamous epithelium of the esophagus meets the secretory simple columnar epithelium of the cardia.

Difficulty: Medium Question 9 of 20

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