Difference between revisions of "Avian Liver - Anatomy & Physiology"

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<big><center>[[Liver - Anatomy & Physiology|'''BACK TO THE LIVER - ANATOMY & PHYSIOLOGY''']]</center></big>
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{{OpenPagesTop}}
<big><center>[[Avian Digestive Tract - Anatomy & Physiology|'''BACK TO THE AVIAN DIGESTIVE TRACT - ANATOMY & PHYSIOLOGY''']]</center></big>
 
 
 
 
 
 
==Structure==
 
==Structure==
  
*2 lobes
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The liver has two lobes. It is dark brown coloured (except just after hatching where it is yellow). The right lobe is larger than the left lobe. It is positioned ventral and caudal to the [[Heart - Anatomy & Physiology|heart]] (as there is no diaphragm). It is closely associated to the '''[[Proventriculus - Anatomy & Physiology|proventriculus]]''' and [[Spleen - Anatomy & Physiology|spleen]]. It has a thin capsule and indistinct lobation. Two bile ducts enter the distal '''[[Duodenum - Anatomy & Physiology|duodenum]]''', one from each lobe of the liver. The duct from the right lobe is connected to the '''[[Gall Bladder - Anatomy & Physiology|gall bladder]]'''. Hepatic lobules are indistinct (except near hilus) due to a lack of '''perilobular connective tissue'''. Avian bile aids the emulsification of fats and contains amylase and lipase.
 
 
*Dark brown coloured (except just after hatching where it is yellow)
 
 
 
*Right lobe larger than left lobe
 
 
 
*Ventral and caudal to the heart (as there is no diaphragm)
 
 
 
*CLosely associated to the proventriculus and spleen
 
  
*Thin capsule
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[[Image:Anatomy of the Avian Liver.jpg|thumb|right|250px|Anatomy of the Liver(Avian)- Copyright RVC 2008]]
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[[Image:Avian Liver and Spleen.jpg|thumb|right|250px|Liver and Spleen (Avian)- Copyright Nottingham 2008]]
  
*Indistinct lobation
 
 
*2 bile ducts enter the distal [[Duodenum - Anatomy & Physiology|duodenum]], one from each lobe of the liver
 
 
*The duct from the right lobe is connected to the [[Gall Bladder - Anatomy & Physiology|gallbladder]]
 
 
*Hepatic lobules indistinct (except near hilus) due to a lack of perilobular connective tissue
 
[[Image:Anatomy of the Avian Liver.jpg|thumb|right|150px|Anatomy of the Liver(Avian)- Copyright RVC 2008]]
 
 
==Function==
 
==Function==
  
*See [[Liver - Anatomy & Physiology#Function|liver funtion]]
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See [[Liver - Anatomy & Physiology#Function|liver function]].
  
 
==Vasculature==
 
==Vasculature==
  
*See [[Liver - Anatomy & Physiology#Vasculature|liver vasculature]]
+
See [[Liver - Anatomy & Physiology#Vasculature|liver vasculature]].
  
 
==Innervation==
 
==Innervation==
  
*See [[Liver - Anatomy & Physiology#Innervation|liver innervation]]
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See [[Liver - Anatomy & Physiology#Innervation|liver innervation]].
  
 
==Lymphatics==
 
==Lymphatics==
  
*See [[Liver - Anatomy & Physiology#Lymphatics|liver lymphatics]]
+
See [[Liver - Anatomy & Physiology#Lymphatics|liver lymphatics]].
 
 
==Histology==
 
  
*Polyhedral and angular cells
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==Gallbladder- Species Differences==
  
*Larger cells than in mammals
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'''Pigeons''' and '''parrots''' lack a [[Gall Bladder - Anatomy & Physiology|gall bladder]].
  
*Large, spherical nucleus
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==Histology==
  
*Base of cell forms a wall of the sinusoid
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The avian liver has '''polyhedral''' and angular cells that are larger than mammal cells. The cells have a large, spherical nucleus and the base of the cell forms the wall of the sinusoid. The cell apices communicate with the '''bile canaliculi'''. They have a granular cytoplasm.
  
*Cell apices communicate with the bile canaliculi
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'''Liver cords''' form columns around the '''interlobular bile capillary'''. The cell arrangement is simpler than in mammals. The sinusoids anastamose freely. There are '''Kupfer cells''' present. Fibres include, '''reticular fibres''' to support the liver cords and '''elastic fibres''' in the capsule and vessels.
  
*Granular cytoplasm
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==Links==
 
 
*Liver cords form columns around the interlobular bile capillary. The cell arrangement is simpler than in mammals.
 
 
 
*Sinusoids anastamose freely
 
 
 
*Kupfer cells present
 
  
*Reticular fibres support the liver cords
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'''Click here for more information on [[Liver - Anatomy & Physiology]]'''
  
*Elastic fibres in the capsule and vessels
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{{Template:Learning
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|flashcards = [[The Avian Alimentary Tract - Anatomy & Physiology - Flashcards|Avian Alimentary Tract]]
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|OVAM = [http://www.onlineveterinaryanatomy.net/content/interactive-avian-anatomy-liver Avian Interactive Anatomy - Liver]
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}}
  
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==Webinars==
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<rss max="10" highlight="none">https://www.thewebinarvet.com/gastroenterology-and-nutrition/webinars/feed</rss>
  
==Species Differences==
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[[Category:Avian Alimentary System - Anatomy & Physiology]]
 
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[[Category:A&P Done]]
*Pigeons and budgerigars lack a [[Gall Bladder - Anatomy & Physiology|gall bladder]]
 
 
 
 
 
==Links==
 

Latest revision as of 16:15, 3 January 2023


Structure

The liver has two lobes. It is dark brown coloured (except just after hatching where it is yellow). The right lobe is larger than the left lobe. It is positioned ventral and caudal to the heart (as there is no diaphragm). It is closely associated to the proventriculus and spleen. It has a thin capsule and indistinct lobation. Two bile ducts enter the distal duodenum, one from each lobe of the liver. The duct from the right lobe is connected to the gall bladder. Hepatic lobules are indistinct (except near hilus) due to a lack of perilobular connective tissue. Avian bile aids the emulsification of fats and contains amylase and lipase.

Anatomy of the Liver(Avian)- Copyright RVC 2008
Liver and Spleen (Avian)- Copyright Nottingham 2008

Function

See liver function.

Vasculature

See liver vasculature.

Innervation

See liver innervation.

Lymphatics

See liver lymphatics.

Gallbladder- Species Differences

Pigeons and parrots lack a gall bladder.

Histology

The avian liver has polyhedral and angular cells that are larger than mammal cells. The cells have a large, spherical nucleus and the base of the cell forms the wall of the sinusoid. The cell apices communicate with the bile canaliculi. They have a granular cytoplasm.

Liver cords form columns around the interlobular bile capillary. The cell arrangement is simpler than in mammals. The sinusoids anastamose freely. There are Kupfer cells present. Fibres include, reticular fibres to support the liver cords and elastic fibres in the capsule and vessels.

Links

Click here for more information on Liver - Anatomy & Physiology


Avian Liver - Anatomy & Physiology Learning Resources
FlashcardsFlashcards logo.png
Flashcards
Test your knowledge using flashcard type questions
Avian Alimentary Tract
OVAMOVAM-no text.png
OVAM
Anatomy Museum Resources
Avian Interactive Anatomy - Liver


Webinars

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