BI 233: Digestive system histology

Salivary Glands

Salivary gland: red→Mucus Acini. Yello—>Salivary Duct. Blue—>Serous Demilunes

Salivary Gland: Green>Salivary Duct. Blue>Serous Demilunes

Mucus Acini cells of salivary glands

Serous Demilunes (Dark boarder around white cells)

Salivary Ducts (simple cuboidal)

Stomach

Stomach

Gastic Pit

Mucosa layer of stomach (Simple Columnar E.)

What layer of the stomach? Which cells are found in this layer?

Green: Gastric Pit, Blue:Gastric Glands. Cells located within the Gastric Glands of the mucosa.
Mucous Neck Cells: Secrets Alkaline mucus coasts stomach and protects it from acids
Chief Cells:Secrets pepsinogen (converts into pepsin enzyme contacted with HCl to break down proteins). Gastric Lipase enzyme breaks down lipids into fatty acids in stomach Parietal cells: Produce HCl (Stomach Acid) and intrinsic factor (Vit. B12 absobtion) G Cells (Entroendocrine): Secret the hormone Gastrin into blood. Stimulates digestion

Submucosa of Stomach

#1a:Gastric Pit. #1b: Gastric Glands-cells (a&b part of Mucosa Layer). #2:Muscularis Mucosa #3:Submucosa

#1a:Simple Columnar E. of stomach Mucosa, Gastric pit (White crypt) #1b:Gastric glands #2:Submuosa of stomach #2:Muscularis Externa

Stomach 1)Mucosa 2)Submucosa 3)Muscularis Externa 4)Serosa

Serosa of stomach

Muscularis externa of Stomach

Duodenum-Small Intestine

Mucosa-Simple (Columnar E.): Vili and Intestinal Crypts

Submucosa: Duodenal Glands secret alkaline mucus

Muscularis Externa then Serosa

Villi of Duodenum (S. Intestine) in Mucosa.

Plica Circularis: Large+deep folds of Mucosa and Submucosa. Vili sit on too of plica circularis

Duodenal/Brunner’s Glands in Submucosa (beneath the Vili).

Secrets Alkaline mucous

Intestinal Crypts of Duadenum

Duodenum

Ileum of S. Intestine

Ileum: red>Vili in mucosa. Blue>Peyer’s Patches in Submucosa. Pink.Muscularis Externa

Peyer’s Patches of the Ileum (s. intestine) located in Submucosa

 

Small Intestine: Duodenum-Jejunum-Ilium

Jejunum (notice absence of Peyer’s patches and duodenal glands)

Large Intestine- Mucosa includes Simple Columnar E. with many goblet cells secreting mucus

L. Intestine: Intestinal Crypts (Deep white pockets)

Portal Triads of the liver- Found at corners of Lobules

Lobules of Liver

What cell?

Goblet cells secret mucus

Liver

Sinusoids of Liver

Hepatocyte cells of liver