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Is innervated by fibers from the esophageal plexus. Resting Muscle Tone . In the circular muscle layer in the superior 3 cm (1.2 in.) of esophagus prevents air from entering . Histology of the Esophagus. Wall of esophagus has three layers. Mucosal. Submucosal. Muscularis Mucosa contains: Nonkeratinized and stratified squamous epithelium ................
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