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。
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。
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。
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