The pineal gland is a small gland in the center of the brain. It secretes melatonin, which plays a role in the circadian rhythms or body clock. It may also affect bone metabolism, mental health, and ...

René Descartes once described the pineal gland as “the principal seat of the soul.” Medical knowledge has vastly progressed since his time, though. Here’s what we know about this critical organ.

Your brain contains a small pine cone-shaped gland called the pineal gland. It’s about the size of a grain of rice. However, that size can vary in animals depending on their location. ‌This tiny gland ...

The pineal gland, a reddish-gray, pine cone-shaped part of the brain, is unremarkable at first glance: It’s about a third of an inch long and tucked deep in the brain, near the center and between both ...