In some amphibians and reptiles, this organ is externally visible and serves as a third eye.
In some amphibians and reptiles, this organ is externally visible and serves as a third eye. In humans it is connected by a stalk to the posterior wall of the third ventricle, and becomes calcified with age, providing a valuable landmark for X-rays of the brain. Also known as the * epiphysis, in the 18th century it was proposed as the site of the soul. It is now known it be important for biorhythms through its secretion of melatonin. FTP, what is this small gland named for its shape?
In some amphibians and reptiles, this organ is externally visible and serves as a third eye.
pineal gland (accept epiphysis until *)