腸胃壁

胃肠壁是消化道的的外層結構，由四层特殊组织组成。从肠道内腔由內而外分別是：

黏膜是胃肠壁的最内层，緊鄰肠道内腔，并与被消化的食物（食糜）直接接触。[1]。

参考文献
  1. Deakin, Barbara Young; et al. 5th. Churchill Livingstone/Elsevier. 2006: 263–265. ISBN 978-0-4430-6-8508.
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