Lamina propria and muscularis mucosae have not yet invaginate in the epithelial lining which forms the fold or villus. Tunica adventitia contains many blood vessels.

  • 可见大量处于分裂期的黏膜上皮细胞,堆积形成很厚的粘膜层,此时固有膜和黏膜肌层尚未凸起进入黏膜上皮形成皱襞或者绒毛,外膜中形成了很多血管。

  • 互联网摘选 2025-02-16 15:28:58

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