LIP:
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Junction between skin and digestive system present on lips.
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Covered on outside by skin and inside by mucous membrane lined by stratified squamous
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keratinized epithelium in ruminants and non keratinized in carnivores and pig.
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Propria submucosa- connective tissue layer contains serous or seromucous labial glands and skeletal muscle bundles.
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Tunica muscularis comprised of skeletal muscle bundles of orbicularis oris muscle.
