Lab+5+-+Digestive - TheDigestiveSystem 2 Groups of...

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The Digestive System
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2 Groups of Digestive Organs: Alimentary Canal Accessory Organs
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Functions Ingestion Propulsion Mechanical digestion Chemical digestion Absorption Defecation (Egestion)
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Wall Structure of the Alimentary Canal Mucosa epithelium with its intrinsic glands lamina propria with MALT/GALT muscularis mucosae Submucosa = loose areolar-dense irregular CT with blood vessels, lymph nodules, nerves, elastic fibers Muscularis externa = inner circular + outer longitudinal layers of smooth muscle Serosa = visceral peritoneum (= layer of mesothelium) and/or adventitia
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Mucosa-Associated Lymphoid Tissues
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Oral Cavity
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Lips http://erl.pathology.iupui.edu/HISTO/WEBJPGS/UGI_03W.JPG Stratified squamous keratinized epithelium
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Teeth Incisors Canine Premolars Molars
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Stratified squamous epithelium (no keratin) salivary glands Oral Cavity Histology: Mucosa + thin Submucosa (some areas) salivary duct
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SALIVA = complex mixture of H2O, ions, mucus, enzymes Parotid – serous cells (thin watery secretion with enzymes and antibodies) Submandibular serous & mucous Sublingual mostly mucous (produce viscid secretion of mucous)
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Lingual salivary gland: serous & mucous
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Submandibular salivary gland, 25x
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Submandibular salivary gland, 100x
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Laryngopharynx stratified squamous Esophagus stratified squamous Oropharynx stratified squamous
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Esophagus & associated structures esophagus trachea glands neck MM
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Esophagus muscularis externa : skeletal sk/sm smooth @ cardiac orifice
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Esophagus lining, 100x NOT KERATINIZED nuclei are present all the way to the lumen
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Esophagus: mucosa
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mucosa submucosa muscularis externa adventitia E S O P H A G U S
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Gastroesophageal (cardiac) sphincter Pyloric sphincter
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Rugae are for expansion of stomach Oblique layer is the 3 rd layer!
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Esophageal – Stomach Junction MALT
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Stomach, fundus
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Cardiac Stomach note the gastric pits
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Lab+5+-+Digestive - TheDigestiveSystem 2 Groups of...

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