Lymph nodes


Lymph nodes act like filters for the lymph fluid. The fluid travels through the reticular tissue and endures the filtering process via the hundreds of lymph nodes which line the lymphatic vessels. Phagocyte cells line the reticular tissue as well, which assist in the filtering process of the lymph fluid.


Lymph nodes appear to be small bean shaped structures which are encased within fibrous connective tissue capsules. The node itself is divided by specialized bands of connective tissue referred to as trabeculae. The lymph is carried into the node via afferent vessels, which then circulates the lymph through a series of channels known as the sinuses.

The efferent lymphatic vessel then bring the lymph fluid out of the node where it then enters a depression located on the concave portion of the node known as the hilum.


Lymph nodes
Image: Lymph Nodes
Playing a vital role in the body’s ability to maintain and utilize an immune system, the lymphocytes are created within the lymph nodules. The lymph nodules are located within the lymph nodes.


Lymph nodes are found throughout the body in specific regions, found in organized groups or clusters. The lower extremity houses the popliteal and inguinal lymph nodes. The pelvic region houses the lumbar lymph nodes.

The upper extremity houses the cubital and axillary lymph nodes. The chest hosts the thoracic nodes, and the cervical nodes are found in the neck. Peyer’s patches, otherwise known as mesenteric patches, are patches of lymphatic tissue found within the small intestine. The smaller clusters of scatter lymphocytes and lymphatic nodules, known as submucosa are also located within the small intestine.

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