APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -The tonsils, spleen, and lymph nodes are referred to as secondary lymphoid organs. These organs do not produce or mature lymphocytes. Instead, they filter lymph and store lymphocytes. It is in these secondary lymphoid organs that pathogens (or their antigens) activate lymphocytes and initiate adaptive immune responses.

Detailed explanation-2: -This system includes the bone marrow, spleen, thymus, lymph nodes, and lymphatic vessels (a network of thin tubes that carry lymph and white blood cells).

Detailed explanation-3: -The lymphoid organs include the red bone marrow, thymus, spleen and clusters of lymph nodes (Fig 1). They have many functional roles in the body, most notably: Production of blood cells, including red blood cells (erythrocytes), white blood cells (leucocytes) and platelets (thrombocytes);