They drain the tonsils and posterior part (back) of pharynx. Tonsillar lymph nodes which are situated just beneath the mandible (jaw bone).They normally become enlarged in the event of an upper respiratory tract infection. Posterior cervical lymph nodes which are located in a line at the back of the neck, extending from the mastoid part of the temporal bone (from about the middle of the head) to the clavicle (collar bone).They drain the internal structures of the throat as well as the tonsils and thyroid gland. Anterior cervical lymph nodes which lie in the front of the neck and are of two types, superficial and deep.There are mainly six different groups of lymph nodes situated in the neck and according to their location they are classified as : In some cases, it may be generalized where lymph nodes in other parts of the body are also involved. Swollen lymph nodes of the neck may be localized, where only groups of lymph nodes in the neck are enlarged. Their enlargement may be an ominous sign since it is most often associated with malignancy and careful assessment and investigation is indicated. Among this group, the supraclavicular lymph nodes are of special significance. While most incidents of cervical lymph node enlargement is self-limiting and resolves quickly, some may persist for a longer time and may need more active management. The most common cause for swollen neck (cervical) lymph nodes is an infection. With age, the incidence of enlarged neck lymph nodes declines except when it is due to some pathology. A swollen neck lymph node is not uncommon and frequently occurs in children, even when there is no disease or obvious cause present. The neck contains a large number of lymph nodes, known as the cervical lymph nodes and many are superficial and easily palpable (can be felt by touch).
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