The pineal gland is the smallest organ in the human body. It's located near the center of the brain, in a groove between the hemispheres. Its size is about 5 to 8 millimeters. The pineal gland is responsible for the production of melatonin, a hormone that regulates sleep cycles.
The pineal gland is a fascinating and complex organ, and its small size belies its importance to our overall health and well-being. While it's not an organ like those found in the abdominal cavity, it plays a crucial role in our bodies.
