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Small Intestine Overview - Anatomy & Physiology (view source)
Revision as of 17:59, 10 December 2010
, 17:59, 10 December 2010no edit summary
[[Image:Mlymph3.jpg|thumb|right|250px|Mesenteric lymph nodes (arrows) of rat- © Research Animal Diagnostic Laboratory]]
[[Image:Mlymph3.jpg|thumb|right|250px|Mesenteric lymph nodes (arrows) of rat- © Research Animal Diagnostic Laboratory]]
The products of fat digestion are transported in the lymph via the [[Lymphatic Vessels - Anatomy & Physiology|lymphatic vessels]], and when fat has been absorbed, it turns the lymph a milky colour. Lymph travels to the mesenteric lymph nodes and then through the efferent vessels that converge to form the cranial mesenteric trunk. The cranial mesenteric trunk drains into the '''chyle cistern'''. This is a dilation of the thoracic duct at its origin. It lies dorsally to the aorta and extends from the diaphragmatic crura to the renal arteries. Flow of lymph is facilitated by movement of the diaphragm in ventilation of the lungs and by pulsation of the aorta.
The products of fat digestion are transported in the lymph via the [[Lymphatic Vessels - Anatomy & Physiology|lymphatic vessels]], and when fat has been absorbed, it turns the lymph a milky colour. Lymph travels to the mesenteric lymph nodes and then through the efferent vessels that converge to form the cranial mesenteric trunk. The cranial mesenteric trunk drains into the '''chyle cistern'''. This is a dilation of the thoracic duct at its origin. It lies dorsally to the aorta and extends from the diaphragmatic crura to the renal arteries. Flow of lymph is facilitated by movement of the diaphragm in ventilation of the lungs and by pulsation of the aorta.
===Species Differences===
In the dog, mesenteric lymph nodes are found mainly around the root of the mesentry. In the pig, they form a long raised band in the middle of the mesentry. They are routinely examined after slaughter as enlargement indicates enteric disease or tuberculosis.
===Carnivore===
Relatively short intestine; in dogs it is approximately three times the body length.
===Equine===
25m in the carcass (in life the figure is much less).
===Ovine===
Up to 25 times body length.
===Bovine===
Up to 50m.
==Histology==
==Histology==
***An outer longitudinal layer
***An outer longitudinal layer
*Serosa is loose connective tissue.
*Serosa is loose connective tissue.
==Links==
==Links==