单词 | lymph nodes |
释义 | lymph nodeslymph nodesLymph NodesLymph Nodesorgans 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 Lymph nodeslymph nodesSmall oval or bean-shaped bodies, up to 2 cm in length, situated in groups along the course of the LYMPH drainage vessels. The nodes have fibrous capsules and are packed with lymphocytes. The main groups of lymph nodes are in the groins, the armpits, the neck, around the main blood vessels in the abdomen, in the MESENTERY and in the central partition of the chest (the MEDIASTINUM). Lymph nodes offer defence against the spread of infection by producing ANTIBODIES, and become involved in the spread of cancer. They can become cancerous, forming LYMPHOMAS.Lymph nodesPatient discussion about Lymph nodesQ. tender protuding lymph node lump rt. arm pit aprox. 1/2" dia. any concerns or recommend treatment necessary? |
随便看 |
|
英语词典包含2567994条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。