anatomy
pineal gland
also: pineal body
a pea-sized mass of nerve tissue attached by a stalk to the posterior wall of the third ventricle of the brain, deep between the cerebral hemispheres at the back of the skull. It functions as a gland, secreting the hormone melatonin . The gland becomes calcified as age progresses, providing a useful landmark in X-rays of the skull. Anatomical name: epiphysis.
Source: mediLexicon corpus · slug
pineal-gland