The pineal gland is the smallest organ in the human body. It's located deep within the cranium, near the brain stem, and measures between 5 to 8 millimeters in size. This tiny gland is responsible for secreting melatonin, which helps regulate sleep cycles.
While the pineal gland is the smallest organ in the body, it's important to remember that other structures, like muscles, bones, and blood vessels, also have tiny components. For instance, the stapes, a bone in the middle ear, is the smallest bone in the human body.
