324Lecture16 digestive tract

324Lecture16 digestive tract - Digestive Tract Part II...

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Digestive Tract Part II
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Esophagus Esophagus - about 10 in. long; function: transportation - swallowing. a) mucosa - epithelium - non-cornified stratified squamous epithelium. - lamina propria - glands present at lower end = Cardiac Glands (shallow esophageals). - Muscularis mucosa present.
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Esophagus b) submucosa - coarse areolar; forms thick folds giving esophagus a star shape. Deep esophageal glands present in lower ½. (ONE OF ONLY THREE PLACES IN THE BODY WHERE SUBMUCOSA HAS GLANDS) c) muscularis externa - mixed tissues; upper 1/3 is skeletal, middle 1/3 mixed smooth/ skeletal, lower 1/3 smooth muscle. Provides for the initiation of the swallowing wave. d) adventitia - areolar CT.
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Upper esophagus
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Stomach Not a simple sac-like structure as imagined - Sphincters (swollen muscle bodies) at both ends controlling back-flows. Food enters stomach as clumpy bolus and leaves as a white, semi-liquid chyme. Stomach wall is thrown into prominent longitudinal folds produced by the submucosa = rugae, grinding devices, allows for expansion/ stretching. Long gastric glands of the stomach are housed in the lamina propria.
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Stomach Stomach Regions: a) Cardiac stomach b) Fundic stomach c) Pyloric stomach. Cardiac Stomach: upper stomach, very small region; Separated from esophagus by the Cardiac Sphincter.
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Cardiac Stomach Mucosa: epithelium - simple columnar epithelium, cells are short-lived - 4-6 days, constantly replaced; form gastric pits. Cardiac glands are mucous secreting; some parietal cells are present. Lamina propria - house cardiac glands. Muscularis mucosa Submucosa - begin to form rugae. Muscularis Externa - a third inner, oblique layer appears; contributes to cardiac sphincter formation. Serosa - no significance
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Fundic Stomach Major anatomical and functional stomach region.
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