BIOL302 Study Guide - Midterm Guide: Muscularis Mucosae, Muscular Layer, Simple Columnar Epithelium
9 Nov 2013
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Mucosa: epithelium, lamina propria (loose connective tissue, muscularis mucosae (smooth muscle) Submucosa: loose/dense irregular connective tissue, contains glands in esophagus and duodenum, blood vessels, nerves. Muscularis externa: inner circular smooth muscle, outer longitudinal smooth muscle, waves of contraction - peristalsis. Adventitia or serosa: outermost layer, small amount of connective tissue, adventitia when connective tissue blends with surrounding structures (ex. Esophagus: serosa when connective tissue faces a body cavity, it is lined by simple squamous epithelium (mesothelium) Mucosa: epithelium - stratified squamous, lamina propria loose connective tissue, muscularis mucosa longitudinal muscle fibres, deeply folded so allow for stretch. Submucosa: loose connective tissue, submucosal glands that secrete mucous. Muscularis externa: inner circular smooth muscle, outer longitudinal smooth muscle, skeletal muscle for voluntary contractions, smooth muscle for involuntary movement. Rugae: folds of mucosa and submucosa for expansion of stomach to accommodate bolus chime. Near opening of esophagus, contains cardiac glands, protect against acid reflux.
