This is normal esophageal squamous mucosa at the left, with underlying submucosa containing mucus glands and a duct surrounded by lymphoid tissue. The muscularis is at the right.
图左边示正常食管鳞状上皮黏膜，黏膜下层内粘液腺体，以及由淋巴组织包围的腺体导管。图右侧示食管肌层。
2
This is normal esophageal squamous mucosa at the left, with underlying submucosa containing mucus glands and a duct surrounded by lymphoid tissue.
图左边示正常食管鳞状上皮黏膜，黏膜下层内粘液腺体， 以及由淋巴组织包围的腺体导管。
3
When it's cold, the arrector muscle pulls the hair up. The duct to the sweat glands gets small to conserve heat.