Digestive tract Esophagus (No.2) Stomach (No.25) Small intestine (No.1) Large intestine (No.26) Appendix (No.27) 下周Quiz2: 皮肤，循环，免疫，消化管 School of Medicine, Zhejiang University 周俊 20190430

Mucosa Submucosa Muscularis externa Adventitia Esophagus

Mucosa Epi. Submucosa LCT, glands Muscularis externa Lamina propria Muscularis mucosae Submucosa LCT, glands Muscularis externa

Mucosa Epi. Lamina propria Muscularis mucosae

Mucus –secreting glands in the submucosa

Esophagus: adventitia

食管－胃交界（esophageal-gastric junction）

Mucosa Submucosa Muscularis externa Stomach Serosa

Mucosa of stomach Epithelium (mucus secreting cells) Parietal cell Lamina propria Chief cell Muscularis mucosae Mucosa of stomach

Mucosa Epithelium Mucus secreting cells Lamina propria CT, Gastric gland Muscularis mucosae Stomach

Parietal cells In the neck and body of the glands Column or pyramidal Eosinophilic cytoplasm Parietal cells

Chief cells In the body and base of the glands Columnar Basophilic cytoplasm Chief cells

胃底腺（fundic gland）

主细胞（chief cell） 壁细胞（parietal cell）

胃幽门部（pyloric region of stomach）

Small intestine Mucosa epi. lamina propria muscularis mucosa Submucosa Muscularis externa Serosa Luminal surface modification: 1.Plicae circulares 2.Intestinal villi 3.Microvilli

Mucosa Submucosa Muscularis externa Serosa Human jejunum

Villus Epithelium 1.absorptive cell striated border (microvilli) 2.Goblet cell Lamina propria CT+SM

肠绒毛（intestinal villus）

示教：中央乳糜管（central lacteal） 锇酸染色

Striated border（纹状缘）/ microvilli （微绒毛）

at the base Paneth cells Intestinal glands Columnar cells Goblet cells at the base Paneth cells （潘氏细胞） At the base of the crypts 3-5 in a group Acidophilic G.

示教：小肠潘氏细胞（Paneth cell）以回肠多见

示教：小肠潘氏细胞（Paneth cell）以回肠多见

Muscularis Mucosa （肌层） Inner circular SM Outer longitudinal SM Myenteric plexus （肌间神经丛）

Serosa CT Mesothelium（most is lost)

十二指肠腺（duodenal gland）

Large intestine

No villi No Paneth cell Numerous Goblet cells

Large intestine: Muscularis externa with myenteric plexus

Appendix

直肠－肛门交界（rectum-anus juncture）

实验报告： 拍典型图片1-2张，word上传 文件名：姓名-学号-Digestive tract（20190430） Small Intestine or stomach 1.Low power: 4 layers 2.High power: Paneth cell or parietal cell, chief cell

The end!