Digestive SystemDigestive Glands
Digestive System igestive System 1 Digestive Glan Digestive Glands
Parotid G.Sublingual GSmall glands--Submandibular G.within the walrof digestive tractliverLarge glands-pancreasesalivary glands, gallbladderpancrease, livergallbladder2
Small glands—— within the wall of digestive tract Sublingual G. Submandibular G. Parotid G. 2 Large glands—— salivary glands, pancrease, liver, gallbladder liver pancrease gallbladder
Salivaryglands*Parotid*SubmandibularG.* Sublingual GGeneral structyre:interstitial:capsule.interlobularsepta,bv., Iv., nf.parenchyma: secretoryendpieces andduct system3
Salivary glands * Parotid * Submandibular G. * Sublingual G. 3 General structure: interstitial: capsule, interlobular septa, bv., lv., nf. parenchyma: secretory endpieces and duct system
Myoepithelial cellsIntercellularMyoepithelial cellssecretory canaliculiSerousntercalateddudemilunrcalatedductsTerminalbarsStriated ductsBasallaminaeMucous tubuleThreetypesofacini*serousmucous*mixedsurrounded by myoepithelialralle
4 Three types of acini * serous * mucous * mixed surrounded by myoepithelial cells
Ductsystem* intercalated duct: simple cuboidal epithelium* striated duct: simple columnar epitheliumLM:radialstriationsEM:infoldings of thebasal plasmamembranewithnumerouselongatedmitchondriaec
Duct system * intercalated duct: simple cuboidal epithelium * striated duct: simple columnar epithelium LM: radial striations EM: infoldings of the basal plasma membrane with numerous elongated mitchondria : 5 * interlobular duct stratified columnar epithelium
Parotid G.Submandibular G.Subtingual G.glandsmixedmixedserousserous predominatemucouspredominateductlongintercalated shortintercalatednointercalatedshortshort striatedmorestriatedstriated6
Parotid G. Submandibular G. Sublingual G. glands serous mixed mixed 6 serous predominate mucous predominate duct long intercalated short intercalated no intercalated short striated more striated short striated
PancreasCenlroacinacell7Pancreaticislet1Serous8Cagillariesymogeniccells9Bleod2intercalatedvesselduct10 Centroacinatcell3Pancreaticislet11Paciniancorpascle4Interiobularconneclivetissuesepla12Interlobular5Bloocductvessel13intertobularconneclivelissuocT,capsule-→parenchyma-→irregularlobulesavacrino nartiant andacrina
Pancreas 7 CT , capsule→parenchyma →irregular lobules exocrine portion + endocrine
BasallaminaIntercalatedductCentroacinarcellsA.Exocrine portion: Nomyoepithelial cellexists.1.Acini:Serous acinicentroacinar cells: inthe lumens of the acini.AcinarcellsZymogengranulespale cytoplasm,squamous or cuboidalinitial portion of theintercalated ductCentroacinarcellsSecretorygranulesSynthesize andsecrete many kinds ofSeroucelenzymesintothe8lumen of small
A.Exocrine portion: No myoepithelial cell exists. 1. Acini: Serous acini centroacinar cells: in the lumens of the acini, 8 pale cytoplasm, squamous or cuboidal, initial portion of the intercalated duct Synthesize and secrete many kinds of enzymes into the lumen of small
2.Duct:no striated ductIntercalatedduct→intralobularduct→interlobularduct-→ mainenumLhrerCommon hepaticductCystic ductCommonbileductGallbladderPancreasPancre atic ductSphincterofOddiMajorDuodenum portionduodenalofthesmallpapillaintestineADAM9
2. Duct: no striated duct Intercalated duct → intralobular duct → interlobular duct→ main pancreatic duct → duodenum 9
B.Endocrine portion(isletsofLangerhans.Pancreas islets):Serousacinus(exocrine)Concept:Palestained endocrinetissues that areIsletofLangerhansdispersed amongthe(endocrine)exocrineacini,andCapillaryrich infenestratedcapillaries.10
B. Endocrine portion (islets of Langerhans, Pancreas islets): Concept: Pale stained endocrine tissues that are 10 dispersed among the exocrine acini, and rich in fenestrated capillaries