Difference between revisions of "Veterinary Education Online"

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<h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Article of the Week - [[Diffusion - Physiology]]</h2>
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<h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Article of the Week - [[Spleen - Anatomy & Physiology|Spleen]]</h2>
 
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[[Image:simpdifdiag.jpg|right|thumb|250px|<small><center>A Simple Schematic Diagram of Diffusion Across a Cell Membrane(Courtesy of Mariana Ruiz Villarreal)</center></small>]]
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[[Image:LH_Canine_labelled_ventrodorsal_abdominal_organs_radiograph.jpg|150px]]
  
Gases or liquids can be unevenly distributed between two areas. If one area has a higher concentration than the other then the differance between these two areas is termed the concentration gradient. The equality is then corrected by the movement of the molecules down this so called gradient from the region of high concentration to that of low. This process is passive as the molecules do not have to be forced to do this and it is reffered to as diffusion.  
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The spleen is a major lymphoid and blood filtration organ and is located in the left cranial abdomen. It is responsible for storing and removing [[Erythrocytes - WikiBlood|erythrocytes]] from the blood as well as antigen surveillance of the blood and antibody production.
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==Development==
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<p>The spleen develops in association with the digestive system in the dorsal mesogastrium, and as the [[Forestomach - Anatomy & Physiology|stomach]] rotates during development the spleen comes to occupy the left cranial abdomen. Haematopoietic cells in the spleen are derived from the AGM (aorta-gonad-mesonephros) and yolk sac and as the [[Primary Lymphoid Tissue - Anatomy & Physiology|primary lymphoid organs]] become established it becomes populated with [[Lymphocytes - WikiBlood#Types|T and B lymphocytes]].</p>
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==Structure==
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<p>The spleen lies vertically on the left side of the cranial abdomen. It is attached to the greater curvature of the [[Alimentary - Anatomy & Physiology#Stomach|stomach]] by the gastrosplenic ligament. The spleen is covered in a enclosed in a capsule of fibrous and elastic tissue that extends into the parenchyma as trabeculae.  </p>
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<p> The parenchyma is supported by a fine mesh of reticular fibres and is divided into two types of tissue, the red and the white pulp. The red and white pulp are separated by the marginal sinus.</p>
  
  
This works by the random thermal movement of molecules. If there is a gas present in an air tight room and then a door is opened into the next room where a lower concentration of the same gas is present the laws of probability state that more of the randomly moving molecules will escape through the door from the area of high concentration than will escape back through the door from the area of low and that eventually the concentrations in both rooms with be approximately the same. The net movement therefore will be from the room with a high concentration to that of a low concentration.
 
  
 
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[[Spleen - Anatomy & Physiology|Click here to read more]]
[[Diffusion - Physiology|Click here to read more]]
 
 
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Revision as of 09:28, 28 October 2008

Welcome to WikiVet,
A collaborative initiative between the UK Vetschools to develop a comprehensive on-line veterinary knowledge base.
5,936 articles.

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Information about the components of blood and associated immunological diseases.


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9th October 2008 - The Wiki is Launched
Attendees of the WikiVet Launch

The WikiVet project was officially launched at MEDEV, Newcastle University. People from varying aspects of the Veterinary, Educational, Pharmaceutical and Medical professions attended the conference. Five people also attended the virtual conference, which made for an exciting yet interactive session. We feel that the launch was a great success and look forward to watching WikiVet grow.

Article of the Week - Spleen

LH Canine labelled ventrodorsal abdominal organs radiograph.jpg

The spleen is a major lymphoid and blood filtration organ and is located in the left cranial abdomen. It is responsible for storing and removing erythrocytes from the blood as well as antigen surveillance of the blood and antibody production.

Development

The spleen develops in association with the digestive system in the dorsal mesogastrium, and as the stomach rotates during development the spleen comes to occupy the left cranial abdomen. Haematopoietic cells in the spleen are derived from the AGM (aorta-gonad-mesonephros) and yolk sac and as the primary lymphoid organs become established it becomes populated with T and B lymphocytes.

Structure

The spleen lies vertically on the left side of the cranial abdomen. It is attached to the greater curvature of the stomach by the gastrosplenic ligament. The spleen is covered in a enclosed in a capsule of fibrous and elastic tissue that extends into the parenchyma as trabeculae.

The parenchyma is supported by a fine mesh of reticular fibres and is divided into two types of tissue, the red and the white pulp. The red and white pulp are separated by the marginal sinus.


Click here to read more


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