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[[Image:Lymph Node positions.jpg|thumb|right|150px|Positions of the lymph nodes (dog) - Copyright B.Catchpole RVC]]

[[Image:Lymph Node positions.jpg|thumb|right|250px|Positions of the lymph nodes (dog) - Copyright B.Catchpole RVC]]

==Introduction==

==Introduction==

''For haemolymph nodes click [[Haemolymph Nodes - Anatomy & Physiology|here]]''

''For haemolymph nodes click [[Haemolymph Nodes - Anatomy & Physiology|here]]''

[[Image:LH Lymph Node Diagram.jpg|thumb|150px|right|<p>'''Diagram'''</p>]]

[[Image:LH Lymph Node Diagram.jpg|thumb|250px|right|<p>'''Diagram'''</p>]]

<p>Part of the [[Lymphatic System Overview - Anatomy & Physiology|lymphatic system]], the body contains hundreds of lymph nodes of varying size (1-20mm) and these are located along the routes of [[Lymphatic Vessels - Anatomy & Physiology|lymphatic vessels]]. They are found throughout the body but are more concentrated in the axilla, groin and mesenteries. Lymph nodes act as a filter for the lymph removing antigens and releasing immune-competent cells and immunoglobulins.</p>

<p>Part of the [[Lymphatic System Overview - Anatomy & Physiology|lymphatic system]], the body contains hundreds of lymph nodes of varying size (1-20mm) and these are located along the routes of [[Lymphatic Vessels - Anatomy & Physiology|lymphatic vessels]]. They are found throughout the body but are more concentrated in the axilla, groin and mesenteries. Lymph nodes act as a filter for the lymph removing antigens and releasing immune-competent cells and immunoglobulins.</p>

==Development==

==Development==

==Structure==

==Structure==

[[Image:LH_Lymph_Node_Follicles_Histology.jpg|thumb|150px|right|<p>'''Primary & secondary follicles'''</p>^{©Nottingham Uni 2008}]]

[[Image:LH_Lymph_Node_Follicle_Histology.jpg|thumb|150px|right|<p>'''Secondary Follicle'''</p>^{©RVC 2008}]]

[[Image:LH_Lymph_Node_Follicles_Histology.jpg|thumb|250px|right|<p>'''Primary & secondary follicles'''</p>^{©Nottingham Uni 2008}]]

[[Image:LH_Lymph_Node_Follicle_Histology.jpg|thumb|250px|right|<p>'''Secondary Follicle'''</p>^{©RVC 2008}]]

===General===

===General===

<p>Grossly the lymph nodes are round or bean shaped and have an outer cortex and an inner medulla. Microscopically the nodes have follicles, paracortical zones and medullary cords and sinuses. At the hilum the medulla is present on the outer part of the node. Lymph nodes are located in series with [[Lymphatic Vessels - Anatomy & Physiology|lymphatic vessels]]. Afferent vessels enter the node on its convex side and efferent vessels exit on its concave side.</p>

<p>Grossly the lymph nodes are round or bean shaped and have an outer cortex and an inner medulla. Microscopically the nodes have follicles, paracortical zones and medullary cords and sinuses. At the hilum the medulla is present on the outer part of the node. Lymph nodes are located in series with [[Lymphatic Vessels - Anatomy & Physiology|lymphatic vessels]]. Afferent vessels enter the node on its convex side and efferent vessels exit on its concave side.</p>