What Are the Organs of the Lymphatic System?

Lymphoid organ is an organ dominated by lymphoid tissues and realizes immune functions in the body. Therefore, immune organs, including thymus, spleen, tonsils, etc., are composed of lymphoid tissues. Their functions are similar to that of lymph nodes. cell. The thymus is located in the upper part of the chest, above the heart. The spleen is located in the upper left part of the abdominal cavity and is the body's largest lymphoid organ. The tonsils are located around the base of the tongue and pharynx. ^[1]

Lymphoid organs

Lymphoid organ is an organ dominated by lymphoid tissues and realizes immune functions in the body. Therefore, immune organs, including thymus, spleen, tonsils, etc., are composed of lymphoid tissues. Their functions are similar to that of lymph nodes. cell. The thymus is located in the upper part of the chest, above the heart. The spleen is located in the upper left part of the abdominal cavity and is the body's largest lymphoid organ. The tonsils are located around the base of the tongue and pharynx. ^[1]

Central lymphoid organs appear earlier during embryogenesis, such as

Peripheral lymphoid organs appear later during embryogenesis, such as

Some roundmouths and a few hard-bone fish still retain the remaining anterior kidney when they are adults, called the head kidney, which is equivalent to the front part of the whole kidney and has immune function. The kidney (of the carp) is crimson on the back of the thorax and abdomen, and is dark red in color. The two kidneys are partially connected. The front end of each kidney is a head kidney,