4 layersmucosa innermost partepitheliumlamina propriamuscualris mucosa (smooth muscle)submucosaloose CTmuscularis externathicker layer of smooth muscle fiberssmooth muscle layer, thicker than muscularis mucosacells arranged in sheetstwo directionserosa or adventitiaserosa- serous membraneadventitia- connective tissueouter most layer and seen in abdomenthin layer of serousadventitiaouter layer of the gut wall when serosa not presentjust CT cells and fibersMovement of GL tractPeristalsisPropels materuals along the length of digestive tract by coordinated contractions of the circular and longitudinal layersForces bolus forwardKnow steps- kinda like ashot gunSegmentationPrimarily the circular muscle fibersBreaks it up into segments the huge chunks of food we eatHandles it easierEnteric Plexus of the GutSubmucosal and myenteric plexusesPart of ANSComposed ofNerve fibers (post ganglionic sympathetic and preganglionc parasympathetic axons)Neuronal ell bodies (mainly post ganglionic parar sympathetic)PeritoneumA serosal membrane composed of 2 layersVisceral peritoneum (seroa of the gi trct)Parietal peritoneumMenistiumFused sheetsRetroperitoneamAttached to posterior abdominal and does not have a mensintaryAscending/descending colonPancreasDeudonumOral CavityMastication- mechanical processingChewing with teeth tongue and the palatal surfacesLubrication by mixing with mucous and serous salivary gland secretionsTongue, teeth, oral cavityVesitbule- space between teeth, gums, and lipsFauces- space where it leaves the oral cavityPalatoglossal archPalatine tonsilPalatopharyngeal archOropharynxUvula- dangling thing in back of the throatLingual frenulum- membrane of tissue on underside of tongueFrenulum of upper lip- tissue connecting upper lip to gumsAids in mechanical processing and manipulation of foodSensory analysis (both general sense and taste)TasteZones look at picturesSalivaLubricates mouthSolubilizes foodsBegins digestion of carbs (amylase)Flushes oral surfaces and covers teethContains lyozymes that helps control bacteriaSalivationControlled by ANSTeethEnamel one and only so don’t destroyAs long as ligament is in tact tooth will stay in socket but shift to be straightEsophagusBehind trachea and primary bronchiSmall part of esophagus has an actual serosaMostly adventitiaMuscularis externa turns from skeletal muscle into smooth muscleYet some plexuses in the upper thirdCh 25 Digestive System Part 1 13/04/2010 18:18:00← 4 layers - mucosa innermost partoepitheliumolamina propriaomuscualris mucosa (smooth muscle)- submucosaoloose CT- muscularis externaothicker layer of smooth muscle fibersosmooth muscle layer, thicker than muscularis mucosaocells arranged in sheetsotwo direction- serosa or adventitiaoserosa- serous membraneoadventitia- connective tissueoouter most layer and seen in abdomenothin layer of serous- adventitiaoouter layer of the gut wall when serosa not presentojust CT cells and fibers← Movement of GL tract- PeristalsisoPropels materuals along the length of digestive tract by coordinated contractions of the circular and longitudinal layersoForces bolus forwardoKnow steps- kinda like ashot gun- SegmentationoPrimarily the circular muscle fibersoBreaks it up into segments the huge chunks of food we eatoHandles it easier← Enteric Plexus of the Gut- Submucosal and myenteric plexuses- Part of ANS- Composed ofoNerve fibers (post ganglionic sympathetic and preganglionc parasympathetic axons)oNeuronal ell bodies (mainly post ganglionic parar sympathetic)← Peritoneum- A serosal membrane composed of 2 layersoVisceral peritoneum (seroa of the gi trct)oParietal peritoneum← Menistium- Fused sheets← Retroperitoneam- Attached to posterior abdominal and does not have a mensintaryoAscending/descending colonoPancreasoDeudonum← Oral Cavity- Mastication- mechanical processingoChewing with teeth tongue and the palatal surfaces- Lubrication by mixing with mucous and serous salivary gland secretions- Tongue, teeth, oral cavity- Vesitbule- space between teeth, gums, and lips- Fauces- space where it leaves the oral cavityoPalatoglossal archoPalatine tonsiloPalatopharyngeal archoOropharynx- Uvula- dangling thing in back of the throat- Lingual frenulum- membrane of tissue on underside of tongue- Frenulum of upper lip- tissue connecting upper lip to gums- Aids in mechanical processing and manipulation of food- Sensory analysis (both general sense and taste)- TasteoZones look at pictures- SalivaoLubricates mouthoSolubilizes foodsoBegins digestion of carbs (amylase)oFlushes oral surfaces and covers teethoContains lyozymes that helps control bacteria- SalivationoControlled by ANS← Teeth- Enamel one and only so don’t destroy- As long as ligament is in tact tooth will stay in socket but shift to be straight← Esophagus- Behind trachea and primary bronchi- Small part of esophagus has an actual serosaoMostly adventitia- Muscularis externa turns from skeletal muscle into smooth muscleoYet some plexuses in the upper third←13/04/2010 18:18:00←13/04/2010