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Avian Intestines - Anatomy & Physiology (view source)
Revision as of 08:32, 10 September 2010
, 08:32, 10 September 2010no edit summary
==Structure==
==Structure==
The '''inestines''' occupy the caudal part of the body. They contact the reproductive organs and the '''[[Gizzard - Anatomy & Physiology|gizzard]]'''. The '''small intestine''' is long and relatively uniform in shape and size. There is no demarcation between the '''[[Jejunum - Anatomy & Physiology|jejunum]]''' and the '''[[Ileum - Anatomy & Physiology|ileum]]'''.
[[Image:Duodenum Avian Anatomy.jpg|thumb|right|250px|Anatomy of the Avian Duodenum and Pancreas - RVC 2008]]
The '''[[Duodenum - Anatomy & Physiology|duodenum]]''' passes caudally over the '''[[Gizzard - Anatomy & Physiology|gizzard]]''' then loops back towards the stomach where it joins the '''[[Jejunum - Anatomy & Physiology|jejunum]]'''. It arises from the right dorsal aspect of the '''[[Gizzard - Anatomy & Physiology|gizzard]]'''. The loop lies ventral on the abdominal floor and the '''[[Pancreas - Anatomy & Physiology|pancreas]]''' lies within the loops. 3 '''pancreatic ducts''' and one '''bile duct''' enter the caudal '''[[Duodenum - Anatomy & Physiology|duodenum]]''' at a common papila.
===[[Jejunum - Anatomy & Physiology|Jejunum]]===
The jejunum has loose coils around the mesentery. It has thin walls so its content appears green. It is suspended from the dorsal wall of the abdomen by the mesentery.
===[[Ileum - Anatomy & Physiology|Ileum]]===
The ileum begins opposite the apices of the '''caeca''' or at the '''vitelline diverticula'''. It is suspended from the dorsal wall of the abdomen by the mesentery .
[[Image:Colon and Caeca Anatomy Avian.jpg|thumb|right|250px|Anatomy of the Avian Colon and Caeca - RVC 2008]]
==Vitelline Diverticula==
===[[Colon - Anatomy & Physiology|colon]]===
[[Image:Vitelline Diverticula.jpg|thumb|right|150px|Vitelline Diverticula Anatomy- RVC 2008]]
The short colon lies ventral to the '''synsacrum''' and opens into the '''[[Avian Vent and Cloaca - Anatomy & Physiology|cloaca]]'''. It runs ventral to the vertebrae and terminates in the '''coprodeum'''. Amino acids and glucose can be absorbed here.
2 '''caeca''' from the '''ileocaecal junction''' run with the '''ileum''' caudally. They are blind sacs, about 16-18cm long. They extend towards the [[Avian Liver - Anatomy & Physiology|liver]] then fold back on themselves. The mesentery runs between the caeca then on towards the [[Ileum - Anatomy & Physiology|ileum]]. It often contains dark coloured material. There are 3 parts of each caeca. It is where the bacterial breakdown of cellulose occurs. Antiperistaltic movements transport chyme and the caeca are emptied a few times per day. Unlike mammals, there are no lacteals in the epithelium.
===Vitelline Diverticula===
[[Image:Vitelline Diverticula.jpg|thumb|right|250px|Vitelline Diverticula Anatomy- RVC 2008]]
The vitelline diverticula is a small outgrowth on the '''[[Jejunum - Anatomy & Physiology|jejunum]]'''. It is the former connection with the yolk sac. It is also called '''Meckel's diverticulum'''.
==Function==
==Function==
See '''[[Small Intestine Overview - Anatomy & Physiology|small intestine overview]]'''.
==Vasculature==
==Vasculature==
See '''[[Small Intestine Overview - Anatomy & Physiology|small intestine overview]]'''.
==Innervation==
==Innervation==
See '''[[Small Intestine Overview - Anatomy & Physiology|small intestine overview]]'''.
==Lymphatics==
==Lymphatics==
Patches of lymphoid nodules are present in '''[[Peyer's Patches - Anatomy & Physiology|Peyer's Patches]]'''. They are most abundant in the '''[[Duodenum - Anatomy & Physiology|duodenum]]'''. There are no mesenteric lymph nodes.
==Species Differences==
==Species Differences==
The '''duck''' and '''goose''' have several loops of 'U' shaped [[Jejunum - Anatomy & Physiology|jejunum]]. '''Pigeons''' have a circular mass of [[Jejunum - Anatomy & Physiology|jejunum]] with inner and outer turns. A long caeca is present in the '''turkey''' and '''chicken'''. '''Pigeons''' and song birds have a short caeca. '''Parrots''' do not have caeca. The dorsal and ventral lobes of the [[Pancreas - Anatomy & Physiology|pancreas]] are connected dorsally in '''poultry'''.
==Links==
'''Test Yourself with the [[The Avian Alimentary Tract - Anatomy & Physiology - Flashcards|Avian Alimentary Tract Flashcards]]'''
[[The Avian Alimentary Tract - Anatomy & Physiology - Flashcards|Avian Alimentary Tract Flashcards]]
[[:Category:Small Intestine - Anatomy & Physiology|Small Intestine - Anatomy & Physiology]]
'''Click here for information on the [[:Category:Small Intestine - Anatomy & Physiology|Small Intestine - Anatomy & Physiology]]'''
[[:Category:Large Intestine - Anatomy & Physiology|Large Intestine - Anatomy & Physiology]]
'''Click here for more information on the [[:Category:Large Intestine - Anatomy & Physiology|Large Intestine - Anatomy & Physiology]]'''
'''Click here for [[Avian Intestines - Histology|Avian histology]]'''
[[Category:Small Intestine - Anatomy & Physiology]]
[[Category:Small Intestine - Anatomy & Physiology]]
[[Category:Avian Alimentary System - Anatomy & Physiology]]
[[Category:Avian Alimentary System - Anatomy & Physiology]]
[[Category:To Do - A&P]]
[[Category:To Do - AimeeHicks]]