Stomach histology

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Upper glandular layer
- Parietal Cells: They are larger and have a distinct, round or triangular shape. Their cytoplasm appears eosinophilic (pinkish) due to the abundance of mitochondria. The nucleus is centrally located and often round.
Deeper aspect of glands
- Chief Cells: These are smaller, and their shape is more columnar or cuboidal. They have basophilic (blue/purple) cytoplasm because of the high concentration of rough endoplasmic reticulum necessary for enzyme secretion. The nuclei of chief cells are typically basal.

GI hormones

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Mnemonic

D cell -> Somatostatin : "Death Star" kills all other hormones
K cells "call to the Kitchen" GIP tells body dinner is ready
I cells "Iron chef cells" CCK cuts up the molecules for digestion
S cells "Stop right there" Secretin stops stomach acid production so the duodenum doesn't get destroyed