"I am located on top of the brain. I make melatonin at night and control gonad activity in winter." Who am I?
Pineal
Pineal gland
Pineal gland is a small, pea-shaped gland in the brain. This gland is the source of melatonin, a hormone which is derived from tryptophan and plays a central role in regulating sleep patterns also called circadian rhythms.