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Histology of the digestive system

Histology of the digestive system. Gastrointestinal tract (GI tract). Mouth: Internal: nonkeratinized stratified squamous epithelium Middle: buccinator muscles, bone. 2. pharynx: skeletal muscle; nonkeratinized stratified squamous epithelium. 3. esophagus:

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Histology of the digestive system

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  1. Histology of the digestive system

  2. Gastrointestinal tract (GI tract) • Mouth: • Internal: nonkeratinized stratified squamous epithelium • Middle: buccinator muscles, bone

  3. 2. pharynx: skeletal muscle; nonkeratinized stratified squamous epithelium

  4. 3. esophagus: a. nonkeratinized stratified squamous epithelium b. skeletal (superior); smooth muscle (inferior)

  5. 4. esophagus to anal canalDeep to superficial • Mucosa • Epithelium: touches food • Nsse – protection • Simple columnar (stomach/intestines)– secretion/absorption • exocrine cells (mucus) • endocrine cells (hormones) • Lamina propria (conn.)- blood/lymph vessels, MALT • Smooth muscle – makes folds, inc. SA

  6. Submucosa • Binds mucosa to muscularis • Blood/lymph vessels/neurons

  7. Muscularis • Skeletal muscle until middle esophagus (swallowing); external anal sphincter • Smooth muscle • Inner: circular fibers • Outer: longitudinal fibers

  8. Serosa: connective and simple squamous epithelium (reduce friction)

  9. ACCESSORY ORGANS

  10. pancreas • Small clusters of glandular epithelial • 99%: called acini (exocrine function – secrete pancreatic juice for digestion) • 1%: called pancreatic islets (endocrine function)

  11. liver • Consists of many lobules • Contains epithelial cells called hepatocytes arranged irregularly around a central vein. Capillaries, called sinusoids, are highly present and contain fixed phagocytes (to removed WBCs and RBC, bacteria, etc)

  12. gallbladder • Mucosa is simple columnar epithelium

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