Part of the Endocrine System - Psychic Centres
Location of the Centre of Enlightenment (Jyoti Kendra)
The pineal gland (also called the pineal body, "Third Eye", epiphysis cerebri, or epiphysis) is a small endocrine gland in the vertebrate brain. It produces melatonin, a hormone that affects the modulation of wake/sleep patterns and photoperiodic (seasonal) functions. It is shaped like a tiny pine cone (hence its name), and is located near to the center of the brain, between the two hemispheres, tucked in a groove where the two rounded thalamic bodies join.Wikipedia