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|backcolour = f5fffa

 

|linkpage =Lymphoreticular & Haematopoietic System - Anatomy & Physiology

==Introduction==

|linktext =Lymphoreticular & Haematopoietic System

[[Image:Deep Lymphatic Drainage Diagram.jpg|right|thumb|200px|Deep Lymphatic drainage - Copyright B.Catchpole RVC]]

|tablelink = Lymphoreticular & Haematopoietic System (Table)- Anatomy & Physiology

<p>Lymphatic vessels are part of the [[Lymphatic System Overview - Anatomy & Physiology|lymphatic system]] and transport [[Lymph - Anatomy & Physiology|lymph]].</p>

|maplink = Lymphoreticular & Haematopoietic System (Concept Map)- Anatomy & Physiology

 

|sublink1=Lymphatic System - Anatomy & Physiology

<p>Lymphatic vessels are part of the [[Lymphatic System - Anatomy & Physiology|lymphatic system]] and transport lymph.</p>

==Development==

==Development==

<p>The lymphatic system develops after the [[Vascular Development - Anatomy & Physiology|circulatory system]] and similarly to blood vessels, lymphatic vessels develop from mesoderm via [[Vascular Development - Anatomy & Physiology#Angiogenesis|angio]] & [[Vascular Development - Anatomy & Physiology#Vasculogenesis|vasculogenesis]]. </p>

<p>The lymphatic system develops after the [[Vascular Development - Anatomy & Physiology|circulatory system]] and similarly to blood vessels, lymphatic vessels develop from mesoderm via [[Vascular Development - Anatomy & Physiology#Angiogenesis|angio]] & [[Vascular Development - Anatomy & Physiology#Vasculogenesis|vasculogenesis]]. </p>

===Tracheal duct===

===Tracheal duct===

<p>The tracheal ducts are paired and originate from the retropharyngeal nodes (except horse) of the head. They run along the trachea before emptying into the thoracic and right lymphatic ducts or may empty directly into the jugular veins.</p>

<p>The tracheal ducts are paired and originate from the retropharyngeal nodes (except horse) of the head. They run along the trachea before emptying into the thoracic and right lymphatic ducts or may empty directly into the jugular veins.</p>

===Thoracic duct===  

===Thoracic duct===  

<p>Originating from the cistern chyli it passes through the aortic hiatus, travelling cranially through the mediastinum and along the left side of the trachea until it empties into the cranial vena cava or commonly the left jugular vein.</p>

<p>Originating from the cistern chyli it passes through the aortic hiatus, travelling cranially through the mediastinum and along the left side of the trachea until it empties into the cranial vena cava or commonly the left jugular vein.</p>

<p>The thoracic duct drains lymph from the left side of the thorax as well as from the cistern chyli. The cistern drains the abdomen, hind limbs and the pelvic regions.</p>

<p>The thoracic duct drains lymph from the left side of the thorax as well as from the cistern chyli. The cistern drains the abdomen, hind limbs and the pelvic regions.</p>

 

==Function==  

==Function==  

<p>Due to their structure lymphatic capillaries are more permeable than vascular capillaries and this mean that they can not only more effectively remove fluid from tissue but also take up large molecules. This allows the lymphatic system to transport large proteins as well as chylomicrons for the transport of fats. The interstitial fluid filtered into the lymphatic vessels is called lymph. As the vessels pass through [[Lymph Nodes - Anatomy & Physiology|lymph nodes]] the lymph is surveyed by immune cells before returning to the blood ensuring that antigens/pathogens from tissues are removed.</p>

<p>Due to their structure lymphatic capillaries are more permeable than vascular capillaries and this mean that they can not only more effectively remove fluid from tissue but also take up large molecules. This allows the lymphatic system to transport large proteins as well as chylomicrons for the transport of fats. The interstitial fluid filtered into the lymphatic vessels is called lymph. As the vessels pass through [[Lymph Nodes - Anatomy & Physiology|lymph nodes]] the lymph is surveyed by immune cells before returning to the blood ensuring that antigens/pathogens from tissues are removed.</p>