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Monogastric Stomach - Anatomy & Physiology (view source)
Revision as of 15:05, 7 July 2008
, 15:05, 7 July 2008no edit summary
==Functional Anatomy==
==Structure and Function==
*Stomach split into regions: cardia, fundic, body and pyloric parts
*Stomach split into regions: cardia, fundic, body and pyloric parts
==Blood Supply==
==Vasculature==
*Coeliac artery (which is a branch of the dorsal aorta)
*Coeliac artery (which is a branch of the dorsal aorta)
==Species Differences==
==Species Differences==
*The size of the non-glandular region in the simple stomach varies between species. It is largest in the horse, pig and then smallest in the dog.
'''equine'''
*Horses have a region called the margo plicatus which separates the glandular and non-glandular parts of the equine stomach. The non-glandular area is lined with squamous epithelium (not columnar).
*Horses have a region called the margo plicatus which separates the glandular and non-glandular parts of the equine stomach. The non-glandular area is lined with squamous epithelium (not columnar).
*The equine stomach is relatively small (10% GIT) with a strong cardiac sphincter which prevents the animal from vomiting. The equine stomach is rarely empty and retention time is short as expulsion into the duodenum stops when feeding stops.
*The equine stomach is relatively small (10% GIT) with a strong cardiac sphincter which prevents the animal from vomiting. The equine stomach is rarely empty and retention time is short as expulsion into the duodenum stops when feeding stops.
*The size of the non-glandular region in the simple stomach varies between species. It is largest in the horse, pig and then smallest in the dog.
*A 500kg horse can produce 30ml of gastric juice in 24 hours
'''Canine'''
*The canid stomach is of variable size ranging from 0.5 to 6L according to breed. A full stomach can touch the bladder.
*The canid stomach is of variable size ranging from 0.5 to 6L according to breed. A full stomach can touch the bladder.
*Carnivores have a subglandular layer of fibroblasts and collagen fibres for protection, e.g. from consuming bones. It is between the glands and the lamina muscularis.
*Carnivores have a subglandular layer of fibroblasts and collagen fibres for protection, e.g. from consuming bones. It is between the glands and the lamina muscularis.
*A 500kg horse can produce 30ml of gastric juice in 24 hours
*A 25kg dog can produce 0.5 to 1L gastric juice in 24 hours
*A 25kg dog can produce 0.5 to 1L gastric juice in 24 hours
'''Porcine'''
*The cardia in the pig is thickened, taking up nearly half the area of the stomach