Medical Sciences 3999A/B/Y Lecture Notes - Lecture 23: Stratified Squamous Epithelium, Lamina Propria, Tooth Enamel
20 Feb 2020
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Alimentary canal proper - mouth to anus (lumen is physically and functionally eternal to the body) Except for the teeth, the mouth is lined by stratified squamous epithelium, with a submucosa (present only in certain regions) Epithelium is non-keratinized stratified squamous; except keratinization occurs on: Exception: hard palate and gingiva have dense irregular ct. Under gingiva, hard palate and dorsum of tongue. Covered by thin skin (stratified squamous keratinized epithelium) Rests on layer of ct with hair follicles and sebaceous glands (associated with hairs and sweat glands) Underlying dermis show high ct papillae with rich vascular plexus --> appears red. Numerous sensory nerve endings in dermis (extremely sensitive to touch) Covered with mucous membrane (stratified squamous keratinized epithelium) Small groups of labial (intramural) glands (mucous secretion into ducts) - situated in lamina propria. Immediately beneath lamina propria: elastic fibres continuous with muscularis mucosae of esophagus. Submucosa present (only where pharynx is continuous with esophagus in lateral walls of nasopharynx)
