IMMUNOLOGY

Detailed explanation-1: -They are widely distributed throughout the body along the lymphatic pathways where they filter the lymph before it is returned to the blood. Lymph nodes are not present in the central nervous system. There are three superficial regions on each side of the body where lymph nodes tend to cluster.

Detailed explanation-2: -They are typically found concentrated near junctions of the major lymphatic vessels, most prominently in the neck, groin, and armpits. Each lymph node is divided into two general regions, the capsule and the cortex.

Detailed explanation-3: -Lymph nodes are located throughout the body, including the neck, armpits, groin, around the gut, and between the lungs. Lymph nodes drain lymph fluid from nearby organs or areas of the body.

Detailed explanation-4: -Usually lymph nodes are not enlarged and thus not able to be felt, but if you have previously had an infection (such as tonsillitis) you may have noticed and felt lymph node becoming enlarged, painful and tender. Lymph nodes can also become enlarged due to cancer cells lodging in them.

Detailed explanation-5: -At studying various groups of the human lymph vessels (inguinal, axillary, peristernal, deep cervical, superior tracheobroncheal, etc.) a certain asymmetry in their structure has been noted. The number of similar lymph nodes at either side is not equal: their number is greater at the right side than at the left.