Galen discussed the pineal gland in the eighth book of his anatomical work On the usefulness of the parts of the body. He explained that it owes its name (Greek: kônarion, Latin: glandula pinealis) to its resemblance in shape and size to the nuts found in the cones of the stone pine (Greek: kônos, Latin: pinus pinea). He called it a gland because of its appearance and said that it has the same function as all other glands of the body, namely to serve as a support for blood vessels.