Esophagus
Author:DR.R.Menaka
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A. The tunica mucosa is composed of 3 layers
1. Stratified squamous epithelium
2. Lamina propria
3. Lamina muscularis
Stratified squamous epithelium - highly keratinized - in ruminants
Stratified squamous epithelium- slightly keratinized - in pigs
Stratified squamous epithelium - in horse more keratinized than pig
Stratified squamous epithelium - non keratinized - in dogs and cat (nature of food)
Note: The degree of keratinization varies with the species.
2. Lamina Propria:
Lamina propria consists of dense network of collagen and elastic fibers.
3. Lamina muscularis:
Lamina muscularis contains only longitudinally oriented smooth muscle bundles.