Pineal gland - Wikipedia The pineal gland (also known as the pineal body[1] or epiphysis cerebri) is a small endocrine gland in the brain of most vertebrates It produces melatonin, a serotonin -derived hormone, which modulates sleep patterns following the diurnal cycles [2]
Pineal gland | Definition, Location, Function, Disorders - Britannica pineal gland, endocrine gland found in vertebrates that is the source of melatonin, a hormone derived from tryptophan that plays a central role in the regulation of circadian rhythm (the roughly 24-hour cycle of biological activities associated with natural periods of light and darkness)