Digestive System Histology

Digestive System Histology - Most follow basic plan of...

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Unformatted text preview: Most follow basic plan of hollow organs Four basic layers: 1.mucosa Epithelium Lamina propria Muscularis mucosa 2. submucosa 3. muscularis externa 4. serosa Tissue Layers of GI Tract MUCOSA 1. Intestinal Epitheilal Layer= 2. Lamina propria = loose connective tissue, may contain lymphoid tissue 3. Muscularis mucosa- thin layer of smooth muscle SUBMUCOSA- denser c.t., but not real dense; May find glands or lymphoid tissue & Blood vessels MUSCULARIS EXTERNA- most often two layers; inner circular; outer longitudinal Actually in helices; tight and loose May find nerve plexi; meissner's at submucosa-muscularis junction Auerbach's between two muscle layers Mostly parasympathetic cell bodies, maybe some SEROSA- loose connective tissue Distinctive features of the esophageal wall include Nonkeratinized, stratified squamous epithelium Folded mucosa and submucosa Mucous secretions by esophageal glands A muscularis with both smooth and skeletal muscle portions Lacks serosa Anchored by an adventitia Histology of the esophagus Figure 24.10 The Esophagus Figure 24.10a-c...
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Digestive System Histology - Most follow basic plan of...

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