When phonation, the mucosa, mucus of infra pharyngeal and esophageal meatus take part in vibration.
发声时，下咽黏膜、食管口黏膜与黏液均参与振动。
2
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。
3
This is normal esophageal squamous mucosa at the left, with underlying submucosa containing mucus glands and a duct surrounded by lymphoid tissue.