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Oesophagus - Anatomy & Physiology (view source)
Revision as of 15:02, 7 July 2008
, 15:02, 7 July 2008no edit summary
==Functional Anatomy==
==Structure and Function==
[[Image:Oesophagus anatomy.jpg|thumb|right|150px|Oesophagus Anatomy - Copywright RVC 2008]]
[[Image:Oesophagus anatomy.jpg|thumb|right|150px|Oesophagus Anatomy - Copywright RVC 2008]]
==Species Differences==
==Species Differences==
*Mucous glands present in horse, cats and ruminants only at pharyngeal-oesophageal junction
*Thick and strong sphincter of tunica muscularis in dogs and pigs
*Ruminants, horse and pig have stratified squamous epithelium continuing from oesophagus into stomach. carnivores have an abrupt transition to columnar epithelium.
'''Canine'''
*Canid has no keratinisation
*Canid has no keratinisation
*Pig and horse have some keratinisation
*Lamina muscularis present caudally in dogs (spirally aranged)
*Ruminant has a lot of keratinisation
*Lamina muscularis absent cranially in dogs
*Lamina muscularis absent cranially in pigs and dogs
*Mucous glands throughout in dog but more abundant caudally
*Lamina muscularis present caudally in pigs (very thick) and dogs (spirally arranged)
'''Equine'''
*Horse has some keratinisation
*Mucous glands abundant cranially but absent caudally in pig
'''Ruminant'''
*Ruminant has a lot of keratinisation
*Mucous glands throughout in dog but more abundant caudally
'''Porcine'''
*Lamina muscularis present caudally in pigs (very thick)
*Mucous glands present in horse, cats and ruminants only at pharyngeal-oesophageal junction
*Lamina muscularis absent cranially in pigs
*Thick and strong sphincter of tunica muscularis in dogs and pigs
*Pig has some keratinisation
*Ruminants, horse and pig have stratified squamous epithelium continuing from oesophagus into stomach. carnivores have an abrupt transition to columnar epithelium.
*Mucous glands abundant cranially but absent caudally in pig
'''Avian'''
*Avian differences- [[Crop- Anatomy and Physiology|the crop]]
*Avian differences- [[Crop- Anatomy and Physiology|the crop]]