Lymph nodes belong to the lymphoid organs and can be found everywhere in the body except in the central nervous system . Heaped they are found in the neck, armpit and groin, where they serve as collection points for the lymphatic vessels of the limbs and the head and neck area. They are 5 to 20 mm in size and oval to bean-shaped. Your bindegewebshaltige capsule encloses an outer cortex ( cortex ) and an inner cord ( medulla ). Inside you can find dense accumulations of lymphocytes and macrophages .
The afferent (afferent vessels) direct the lymph in the marginal sinus ( sinus submarginales ). From there it flows over Intermediärsinus ( sine capsulares ) to the marrow sinus ( sinus medullares ) that they collect and in the efferent vessels ( vasa efferentia conduct).
In the lymph nodes, the lymph is analyzed and filtered to harmful substances. In an infection in the catchment area of a lymph node can take the lymph antigens in the lymph nodes. Here they meet at these antigens specific lymphocytes and stimulate their proliferation, which can lead to a swelling of the lymph node. The lymphocytes formed are distributed to fight the infection throughout the body.
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