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Large Intestine Overview - Anatomy & Physiology (view source)

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~~|linkpage =Alimentary - Anatomy & Physiology~~

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~~|linktext =Alimentary System~~

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==Introduction==

[[Image:smalllargeintestine.jpg|thumb|right|150px|Illustration of the jejunum, caecum, transverse and ascending colon - © RVC 2008]]

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***The efferent vessels of these lymph nodes converge to form the caudal mesenteric trunk which unites with the cranial mesenteric trunk to open into the chyle cistern.

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==~~Histology==~~

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==[[Large Intestines - Histology|Histology]]==

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[[~~Image:mucosal layer of colon.jpg|thumb|right|150px|Mucosal Layer of Colon (Fox)~~ - ~~© RVC 2008]]~~

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*The mucosa of the large intestine is smooth; there are '''no villi or microvilli'''.

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*Mucosal glands are much longer and straighter.

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*The number of goblet cells in the mucosa is increased compared to the [[Small Intestine Overview - Anatomy & Physiology|~~small intestine~~]].

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**Mucus is very important for lubrication of the ingesta as it passes through the intestine, particularly as more water is absorbed from the lumen making chyme drier.

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*There are numerous scattered lymph nodules.

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**The number of lymph nodules increases compared to the [[Small Intestine Overview - Anatomy & Physiology|small intestine]].

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*The submucosa is much reduced in thickness.

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*'''Taenia''' may be present.

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**These are concentrations of the longitudinal muscle layer into long bands.

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**When the taenia contract, they cause shortening of the large intestine, which produces saccualtions, or '''haustra'''.

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***Haustra help to mix the content and to slow the transit time

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*Many glands are present in the mucosa and skin of the anal region.

==Species Differences==

Bara

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