Lymph Nodes


Also found in: Dictionary, Thesaurus, Medical, Wikipedia.
Related to Lymph Nodes: lymphoma

Lymph Nodes

 

organs of the lymphatic system in the higher vertebrates and man.

The lymph nodes are oval formations along the path of the lymphatic vessels that consist of reticular tissue enclosed in a connective-tissue capsule and in which lymphocytes are formed. The lymph flow in the narrow cavities (sinuses) of the nodes is retarded markedly, facilitating the capture by leukocytes (phagocytes) of foreign particles entering from the tissues through the lymphatic vessels and preventing their entry into the blood. Thus, the more lymph nodes (and their number increases in the progression from the lower mammals to man), the stronger the barrier protecting the body from pathogenic principles. In man, the dimensions of the lymph nodes vary from 3 mm to 30 mm. However, with certain diseases, these dimensions may increase sharply (for example, the otic nodes, in cases of epidemic parotitis or tonsillitides), sometimes even reaching the size of a hen’s egg.

V. B. SUKHANOV

References in periodicals archive ?
Immunohistochemical detection of micrometastases in pelvic lymph nodes from patients with urothelial cancer of the urinary bladder.
Mesenteric lymph nodes may show a wide variation in degree of reactive hyperplasia between animals due to stimulation by antigens in the gastrointestinal tract (Elmore, 2006b).
The main criteria used for the detection of cervical lymph node metastases in this study was size of the lymph nodes.
Lymph nodes are secondarily involved in a variety of systemic diseases, local injuries, and infections.
Cells were obtained from lymph nodes of interest by an experienced interventional pulmonologist via endoscopic transbronchial needle aspiration, or fine-needle aspiration where accessible.
Surgeons subsequently removed suspected lymph nodes those identified by Lymphoseek and those based upon tumor location and surgical practice for pathologic examination.
In 20 percent of patients with melanoma, the cancer has already spread to nearby lymph nodes when they are diagnosed with the disease.
Probably, when SLN was tracked by nano-carbon, lymph nodes were black, and parathyroid gland was not stained; but when SLN was tracked by methylene blue, both lymph nodes and parathyroid were stained blue, which could hardly be identified.
Lymph node enlargement (lymphadenopathy) is the most common presentation in many neoplastic and nonneoplastic diseases.
sup][3] Despite a high survival rate (5- and 10-year overall survival of 90% and 95%, respectively [sup][4]), patients with lymph node metastasis of PTCs have an increased rate of extrathyroidal invasion, local recurrence, and distant metastasis.
1 Tuberculosis commonly involves superficial lymph nodes including those in posterior and anterior cervical chains or the suprascapular fossae and others like submandibular, periauricular, inguinal and axillary groups may also be involved.
All suspicious lymph nodes should be removed, but the extent of lymphadenectomy should be based on the NCCN guidelines.