GI System Esophagus Stomach Laboratory Orientation 126 HE

GI System: Esophagus & Stomach Laboratory Orientation

#126 H&E Mid-esophagus Lamina propria Muscularis mucosae Muscularis Externa Submucosa Skeletal muscle Mixed smooth and skeletal muscle Submucosal sero -mucous gland

#126 Esophagus Also #153 Muscularis mucose Submucosal gland

Muscularis Externa of mid-esophagus (#126): Skeletal and smooth m. Muscularis Externa of lower esophagus (#155): Smooth muscle only

#155: Cardiac Stomach Cardio-esophageal junction (arrow) Car dia cg lan ds

#156: Fundic Stomach Rugae

Mucosa of the Fundic Stomach Muscularis mucosae Lymphatic nodule

#156, #157: Mucous neck cells Fundus or body Gastric glands Gastric pit lined by surface mucous cells

#157: Body of the gastric glands

#157: Base of the gastric glands Parietal cells Chief cells

#162 Pylolic Stomach Pylo-duodenal junction (arrow) Pyloric sphincter muscle Duodenum

Fundic (gastric) glands: straight glands pit: gland=1: 5 Cardiac glands: coiled (mucous) glands pit: gland=1: 1 Pyloric glands: coiled (mucous) glands pit: gland=2~3: 1

GI System: Small and Large Intestine Laboratory Orientation

#29 Small Intestine Submucosa (connective tissue) Lumen Mucosa (epithelium + lamina propria) Muscularis mucosae Mesentery (ct + epithelium) Muscularis Externa (smooth muscle)

#29 – Intestinal Villi Intestinal villi

#29 -Simple columnar epithelium with striated border (microvilli) and goblet cells Goblet cells ? Enterocytes Microvilli (striated border)

#162 Pylo-duodenal junction (arrow) Pyloric sphincter muscle

#161 Pylo-duodenal Junction and Pancreas Pyloric stomach Duodenum Pyloric stomach m Duodenu Pancreas

#161 Brunner’s gland Muscularis mucosae Lymphatic nodules

#161, 162 Duodenum Brunner’s glands pancreas Muscularis mucosae crypts or i. glands Intestinal villus Lumen

#29, 168 Jejunum or Ileum lumen Muscularis mucosae submucosa Crypts of Lieberkuhn

#29, Intestinal glands (crypts) ? Mitotic cell ? Paneth cells ? Enteroendocrine cells

#246 UCSF Enteroendocrine cell Paneth cell

#29, Myenteric (Auerbach’s) plexus Ganglion cells

#176: Colon (Mucosa of the colon) m. m No villi, Straight glands, lots of goblet cells

#176 – colon mucosa

#177 -1, 177 -3, 177 -2 Recto-anal junction Hemorrhoidal veins Muscularis mucosae Type of epithelium changes Muscularis mucosae frays Dilated veins