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324Lecture15 pharynx mouth - Digestive Tract A journey...

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Digestive Tract A journey through The Alimentary Canal
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Digestive Tract a) Oral Cavity b) Tubular Tract c) Major Digestive Glands
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Digestive Tract Functions: a) physical treatment – mastication b) secretion – water, bicarbonate, enzymes c) chemical treatment - digestion d) transportation - swallowing, peristalsis. e) absorption – assimilation f) elimination - defecation
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Oral Cavity Lips - skeletal muscle embedded between a) inner fibroelastic areolar (lamina propria) covered with non-cornified stratified squamous epithelial mucosa, continuous with cheek (same except addition of sub-mucosa in cheek). b) outer fibroconnective CT (dermis); covered with cornified strat. squamous epithelium (epidermis). No hair or glands, moistened only by licking
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Oral Cavity Tongue - skeletal muscle core covered with mucosa. Upper surface rough, non-cornified stratified squamous epithelium with papillae. Upper surface divided into two regions: 1) lingual tongue - free, distal half covered with tall hair-like papillae in rows on anterior center of the tongue (filiform); mushroom shaped papillae on tip of tongue (fungiform); leaf-shaped papillae on side of tongue (foliate) - poorly developed in humans.
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Tongue 2) lymphoid tongue - basally attached zone; separated from the lingual by a V-shaped groove (sulcus = pit; Sulcus terminalis).
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