APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -The spleen acts as a filter. It weeds out old and damaged cells and helps control the amount of blood and blood cells that circulate in the body. The spleen also helps get rid of germs. It contains white blood cells called lymphocytes and macrophages.

Detailed explanation-2: -A lymph node contains lymphoid tissue, i.e., a meshwork or fibers called reticulum with white blood cells enmeshed in it. The regions where there are few cells within the meshwork are known as lymph sinus . It is lined by reticular cells, fibroblasts and fixed macrophages.

Detailed explanation-3: -Lymph is filtered as it passes through lymph nodes. This process removes bacteria and viruses before the lymph returns to the bloodstream. Lymph nodes become enlarged when they trap germs and when white blood cells arrive to fight the infection.