Final answer:
The spleen is situated in the upper left quadrant of the abdominal cavity, behind the stomach and near the left kidney.
Step-by-step explanation:
The spleen is located in the upper left quadrant of the abdominal cavity in back of the stomach. It is a lymphatic organ that plays a role in the immune response by removing pathogens and old red blood cells from the blood.
The spleen is also involved in producing lymphocytes for the body's immune defenses, sitting adjacent to the left kidney and attached to the stomach.