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Anatomy Encyclopedia Entry 1777478656

The **spleen** is a vital organ located in the abdominal cavity, playing a crucial role in the immune system, filtering the blood, and storing red blood cells. ## Overview The **spleen** is a soft, spongy organ approximately the size of a fist, weighing around 150 grams in adults. It is situated in the upper left region of the abdominal cavity, beneath the diaphragm and above the stomach. The **spleen** is surrounded by a fibrous capsule, which helps maintain its shape and protects it from external damage. It is connected to the stomach via the splenic artery and to the liver via the splenic vein. The **spleen** has several functions, including filtering the blood, storing red blood cells, and acting as a reservoir for immune cells. It contains a network of blood vessels, including arteries, veins, and capillaries, which allow it to perform its various functions. The **spleen** also contains a type of immune cell called macrophages, which help to remove pathogens and other foreign substances from the blood. ## History/Background The **spleen** has been known to humans for thousands of years, with ancient civilizations recognizing its importance in the body. In ancient Greece, the **spleen** was associated with the concept of "black bile," one of the four bodily humors believed to influence a person's health and temperament. The Greek physician Galen (129-216 AD) wrote extensively about the **spleen**, describing its role in filtering the blood and storing red blood cells. In the Middle Ages, the **spleen** was often associated with melancholy and depression, as it was believed to be responsible for producing "black bile." It wasn't until the 17th century that the **spleen** began to be understood as a vital organ, with the work of English physician Thomas Sydenham (1624-1689) helping to clarify its functions. ## Key Information The **spleen** is a vital organ that plays a crucial role in the immune system. It filters the blood, removing pathogens and other foreign substances, and stores red blood cells for later use. The **spleen** also acts as a reservoir for immune cells, such as macrophages and lymphocytes, which help to fight infection. In addition to its immune functions, the **spleen** also helps to regulate the body's iron levels by storing and recycling iron from red blood cells. The **spleen** is also involved in the production of antibodies, which help to fight infection and disease. ## Significance The **spleen** is an essential organ that plays a vital role in maintaining the body's overall health. Its functions are critical to the immune system, and its removal or damage can have serious consequences. In some cases, the **spleen** may need to be removed surgically, a procedure known as splenectomy, which can be necessary in cases of trauma, infection, or cancer. The **spleen** is also an important organ in the context of blood disorders, such as anemia and hemolytic disease. In these cases, the **spleen** may be enlarged or damaged, leading to a range of symptoms and complications. INFOBOX: - Name: Spleen - Type: Organ - Date: Ancient civilizations (approx. 3000 BCE) - Location: Abdominal cavity - Known For: Filtering the blood, storing red blood cells, acting as a reservoir for immune cells TAGS: **Spleen**, **Immune system**, **Blood**, **Red blood cells**, **Macrophages**, **Lymphocytes**, **Antibodies**, **Iron regulation**, **Splenectomy**