Digestive system1
Digestive system 1
OralcavitMouthdigestive tract ------oralPharynxTonguecavity,esophagus,Salivaryglandsstomach,small andlarge intestine,appendix, rectum andStomachLive!anusdigestiveglandssalivary glands, liver,andpancrease,Gall-bladdergallbladder, (there aresomesmallglandsPancreaslocated inthewall ofSmalldigestivetract).intestineLargeFunctionintestineRectumAnus
digestive tract -oral cavity, esophagus, stomach, small and large intestine, appendix, rectum and anus digestive glands - salivary glands, liver, 2 and pancrease, gallbladder, (there are some small glands located in the wall of digestive tract). Function
DigestiveTract内环肌Inner circularmuscle上皮Epithelium食管腺固有层EsophagealgandYLaminapropria粘膜肌层Muscularismucosae福-粘膜下层Submucosa小血管Smallbloodvessel纤维膜Fbrosa外纵肌Outer longitudinal muscle食管微细结构H·E低倍Microstructure of esophagus
Digestive Tract 3
esophagusstomach,smallintestinelargeintestineEpitheliumstratifiedsquamousepisimplecolumnarepi.gastric glandsMucosaLaminaintestinal glandspropria(L.C.T containing lymphoid tissue)Muscularis mucosaathin layer of smooth muscle cells)(D.c.T,submucosal(Meissner's)nerveplexus)esophaguealSubmucosaglandsduodenal glandss.m.inner:circularupper:skeletal; middle:aouter: longitudinalMuscularismixture;lower:smoothmyenteric(orAuerbach's)nerveplexusAdventitiaserosa4fibrosa
esophagus stomach, small intestine, large intestine Mucosa Epithelium stratified squamous epi. simple columnar epi. Lamina propria gastric glands intestinal glands (L.C.T containing lymphoid tissue) 4 Muscularis mucosa(a thin layer of smooth muscle cells) Submucosa (D.C.T, submucosal (Meissner’s ) nerve plexus) esophagueal glands duodenal glands Muscularis upper: skeletal; middle: a mixture; lower: smooth s.m. inner: circular outer: longitudinal myenteric (or Auerbach’s ) nerve plexus Adventitia fibrosa serosa
Il.EsophagusA.Mucosa:Non-keratinized stratifiedsquamous epithelium.lamina propriaplicamuscularis mucosaeB.Submucosa:esophagealmucusglandsC.Muscularis:2 layers:inner, outerupper1/3:Skeletalmiddle 1/3: mixedlower1/3:smoothD.Adventitia:FibrosaMRT
II. Esophagus A.Mucosa: Non-keratinized stratified squamous epithelium. lamina propria muscularis mucosa B. Submucosa: esophageal mucus glands C. Muscularis: 2 layers: inner, outer upper 1/3:Skeletal plica e 5 middle 1/3: mixed lower 1/3: smooth D. Adventitia: Fibrosa
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