ACB 406.3 Lecture Notes - Lecture 12: Stratified Squamous Epithelium, Muscularis Mucosae, Muscular Layer
24 Oct 2018
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Layer 1 mucosa (composed of 3-sub layers: epithelium (varies by region, lamina propria of loose vascular ct, muscularis mucosa (smooth muscle) Layer 2 submucosa: contains loose vascular ct and larger blood vessels, contain glands and lymphoid tissue that vary by region. Layer 3 muscularis externa (generally thick & varies by region: smooth muscle arranged in: Layer 4 adventitia: consists of ct that either blends w/ surrounding ct or underlies the peritoneal mesothelium. Submucosa has folds: has a core of submucosa = fold, projection of the epithelium = lamina. Hard to see the muscularis mucosa: lymphoid organs = nodules of loose lymphoid tissue. Animals that do not swallow: amphibians (e. g. frogs, roof of mouth and esophagus of toad have ciliated columnar epithelium w/ goblet cells, cilia moves food to the stomach. Layers of the stomach: the basic plan is the same. Submucosa: loose ct, blood vessels, submucous plexus (not shown) Muscularis externa has smooth muscles in 3 orientations: oblique, circular, longitudinal.
