CardiaFundusEsophagusdigestionIll. Stomach:MuscularisSerosaexterna·longitudinal layer·circular layer-Bodyoblique layerLesserRugaeofcurvature: Organ formucosaPylorusGreatercurvatureDuodenumPyloricPyloricPyloric6canalsphincterantrum(a)(valve)
digestion. III. Stomach: 6 Organ for
7
A. Mucosa:rugea,gastric pits1.Epithelial cellsSurface lining cellMucosaGastricLM: simple columnarpitGastricwithglandproperOxyntic (parietal)celltight junctionssurface mucousSubmucosacellsZymogenic (chietf) cellFunction:secreteinsolublealkalineEnteroendocrinecell(APUDcell)mucus8
A. Mucosa: rugea, gastric pits 1. Epithelial cells LM: simple columnar with 8 tight junctions surface mucous cells Function: secrete insoluble alkaline mucus
Mucous-HCO3-barpH~2ingastric juice?thick gel layerMucuslayerGastricPH~7mucus·containing highlyat cellcellsurfaceMucusdropletsconcentratedHCO3HCO3HCO3tightjunctionsaroundsurfaceandpit cellsCapillary9
Mucous-HCO3-barrier •thick gel layer •containing highly 9 concentrated HCO3 •tight junctions around surface and pit cells
胃小叫Gastric pit2. Lamina propriaCT and gastric glands颈部ineckneck, body and base体部Thdyopens atgastric pit胃底腺Fundicgland5 types of cell:parietal cell, chief cell.底部Thebasemucous neck cell,enteroendocrine cell,stemcell粘膜肌层Muscularismucosae10
2. Lamina propria CT and gastric glands neck, body and base 10 opens at gastric pit 5 types of cell: parietal cell, chief cell, mucous neck cell, enteroendocrine cell, stem cell