Nerve net on right found in the two plexi
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Transcript of Nerve net on right found in the two plexi
• General FunctionsGeneral FunctionsIntracellular vs Extracellular Intracellular vs Extracellular DigestionDigestionGastrointestinal Tract - two wayGastrointestinal Tract - two wayAlimentary Canals - Linear Alimentary Canals - Linear specializationspecializationMechanical and Chemical Mechanical and Chemical DigestionDigestionDigestive organs vs Accessory Digestive organs vs Accessory organsorgans
Basic Structural Basic Structural PlanPlanMucosaMucosaEpitheliumEpitheliumLamina propriaLamina propriaMuscularis mucosaMuscularis mucosaSubmucosaSubmucosaPlexus of MeissnerPlexus of MeissnerPlexus of AuerbachPlexus of AuerbachMuscularis ExternaMuscularis ExternaSerosa or Serosa or AdventitiaAdventitia
Basic Structural PlanBasic Structural PlanMucosaMucosa
EpitheliumEpitheliumLamina propriaLamina propriaMuscularis mucosaMuscularis mucosa
SubmucosaSubmucosaPlexus of MeissnerPlexus of MeissnerPlexus of AuerbachPlexus of AuerbachMuscularis ExternaMuscularis ExternaSerosa or AdventitiaSerosa or Adventitia
Nerve net on right found in the two plexi
No matter what part of the digestive tube, the plan is fundamentally identical with areas specialized for particular functions as needed. Folding increases surface area, glands changes secretions, and muscle enlargement for mechanical controls including sphincters.
This is a longitudinal section through the esophagus. Only part with stratified squamous epithelium (except for anus)
MouthMouthLipsLipsBuccal WallBuccal WallGingivaGingivaTongueTonguePalate - Soft and HardPalate - Soft and HardOropharynxOropharynxBuccal cavityBuccal cavity
• Lips - Red Free marginLips - Red Free margin• Labial frenulum - Labial frenulum -
Inferior & SuperiorInferior & Superior• Lingual frenulumLingual frenulum• Gingiva and Alveolar Gingiva and Alveolar
processes and socketsprocesses and sockets• DentationDentation
Milk or baby teethMilk or baby teethAdult teethAdult teethAnother set?Another set?
• Tooth types - Tooth types - modified for modified for functionsfunctions
• Crown and RootCrown and Root• Incisors – CuttingIncisors – Cutting• Canines or Cuspids – Canines or Cuspids –
GraspingGrasping• Premolar or Bicuspid Premolar or Bicuspid
– Grinding– Grinding• Molar - GrindingMolar - Grinding
CrownCrownEnamelEnamelDentine - Dentine -
Tome’s fibersTome’s fibersNeck - cervixNeck - cervixRootRoot
Pulp cavityPulp cavityDentinDentinCementumCementum
Apical foramenApical foramenPeridontal ligamentPeridontal ligament
CrownCrown Enamel Enamel Dentine - Tome’s fibers Dentine - Tome’s fibers Neck - cervix Neck - cervixRootRoot Pulp cavity Pulp cavity Dentin Dentin Cementum CementumApical foramenApical foramenPeridontal ligamentPeridontal ligament
Tongue Tongue structurestructureSensory ZonesSensory ZonesPapillaePapillaeFiliformFiliformFungiformFungiformCircumvalateCircumvalate
• Thyroglossal Duct remnant
• Terminal Sulcus• Vallate Papillae• Foliate Papillae• Fungiform
Papillae • Median Sulcus • Filiform Papillae
Food coloring on tongue shows the distribution of fungiform papillae
IntrinsicIntrinsic
ExtrinsicExtrinsic
Parotid - Stensen’s ductParotid - Stensen’s ductSerousSerousWaterWaterElectrolytesElectrolytesAmylaseAmylaseNo mucinNo mucinSubmaxillary orSubmaxillary orSubmandibular - MixedSubmandibular - MixedSublinginaLSublinginaLMucusMucusno enzymeno enzyme
Composition of SalivaComposition of SalivaWater - 99.5%Water - 99.5%Electrolytes- Na, Cl, K, Electrolytes- Na, Cl, K, Blood typing proteinsBlood typing proteinsMucin forms mucus; lubricantMucin forms mucus; lubricantUreaUreaImmunoglobin AImmunoglobin ABicarbonates- buffers pHBicarbonates- buffers pHPhosphates - buffers pHPhosphates - buffers pHAmylase - activated by chloride ionsAmylase - activated by chloride ions
Lubrication and bindingLubrication and bindingSolubilizes dry foodSolubilizes dry foodOral HygieneOral Hygiene
Oral cavity flushed with salivaOral cavity flushed with salivaBacteria grow during sleep - Dragon breathBacteria grow during sleep - Dragon breathSaliva contains lysozymes to kill bacteriaSaliva contains lysozymes to kill bacteria
Initiates starch digestion - limitedInitiates starch digestion - limited
Approximately 18 inchesApproximately 18 inchesCollasped tube no sphinctersCollasped tube no sphinctersEsophageal mucus glandsEsophageal mucus glandsNo digestionNo digestionDeglutitionDeglutition
Voluntary Oral PhaseVoluntary Oral PhaseInvoluntary Pharyneal PhaseInvoluntary Pharyneal PhaseInvoluntary Esophageal PhaseInvoluntary Esophageal Phase
Peritoneum - SomaticPeritoneum - SomaticPeritoneum - VisceralPeritoneum - VisceralAbdominal cavity Abdominal cavity Intra-peritoneal organsIntra-peritoneal organsRetroperitoneal organsRetroperitoneal organsMesentaryMesentaryThe MesentaryThe MesentaryMesocolonMesocolonGreater OmentumGreater OmentumLesser OmentumLesser Omentum
Greater Greater Omentum Omentum Lessor Lessor OmentumOmentum