*Thick and strong sphincter of tunica muscularis in dogs and pigs
*Thick and strong sphincter of tunica muscularis in dogs and pigs
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*Ruminants, horse and pig have stratified squamous epithelium continuing from oesophagus into stomach. carnivores have an abrupt transition to columnar epithelium.
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*Ruminants, horse and pig have stratified squamous epithelium continuing from oesophagus into stomach. Carnivores have an abrupt transition to columnar epithelium.