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Comprehensive Histological Overview of the Oral Epithelium and Gastrointestinal Tract

This anatomical study provides an in-depth examination of the oral epithelium, including stratified squamous non-keratinized epithelium observed in the buccal surface and tongue's gustatory receptors such as filiform, circumvallate, and fungiform papillae. It explores the mucosal layers of the esophagus, stomach, and small intestine, highlighting structural features like gastric pits and intestinal crypts. Additionally, the presence of goblet cells, Peyer's patches, and the variations between jejunum and ileum are noted. The histological characteristics of salivary glands, pancreas, liver, gallbladder, and reproductive organs are also reviewed.

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Comprehensive Histological Overview of the Oral Epithelium and Gastrointestinal Tract

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Presentation Transcript

  1. Final Unit Histology Slides

  2. Oral Epithelium Buccal surface – stratified squamous non-keratinized epithelium

  3. The Tongue & Gustatory Receptors Filiform Papillae Circumvallate Papillae Gustatory Receptor Fungiform Papillae

  4. Esophagus Muscularis Mucosa Submucosa Note the thick stratified squamous epithelium of the mucosa as well as the submucosa and muscularis layers.

  5. Stomach gastric pit mucosa lamina propria muscularis mucosae Identify the mucosa and its layers, as well as the gastric pits.

  6. Duodenum

  7. Microvilli SEM Microvilli TEM

  8. Jejunum & Ileum Main difference is the absence of the submucosal glands or duodenal glands in the jejunum and ileum. Goblet cells are stained blue in this picture, and intestinal crypts are visible as well. These two portions of the small intestine are very similar, so we won’t separate them out histologically. There will be a gradual decrease in the number and size of villi as you progress towards the ileocecal valve, as well as an increase in the quantity of Peyer’spatches.

  9. Ileum – Peyer’s Patches The large lymphatic nodules are the Peyer’s Patches, notice also the intestinal crypts and villi with increasing numbers of goblet cells.

  10. Colon Section of the large intestine, notice the high concentration of goblet cells.

  11. Salivary Glands Parotid Gland Submandibular Gland Sublingual Gland

  12. Pancreas Pancreatic Islet Note the staining is different, showing the pancreatic islet with darker cells than the surrounding acini. Pancreas viewed at low magnification, showing both the endocrine (pancreatic islets) and the exocrine cells.

  13. Liver Liver Lobule with central vein in middle, sinusoids visible as white spidery lines going towards the central vein.

  14. Galbladder

  15. Ovary with Follicles

  16. Ovary showing Corpus Luteum

  17. Uterus endometrium myometrium perimetrium

  18. Testis & Epididymis

  19. Penis corpora cavernosae corpora spongiosum spongy (penile) urethra

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