ponsListen to pronunciation(ponz)Part of the central nervous system, located at the base of the brain, between the medulla oblongata and the midbrain. It is part of the brainstem.Enlarge this image in new windowAnatomy of the brain, showing the cerebrum, cerebellum, brain stem, and other parts of the brain.Enlarge this image in new windowAnatomy of the inside of the brain, showing the pineal and pituitary glands, optic nerve, ventricles (with cerebrospinal fluid shown in blue), and other parts of the brain.Search NCI's Dictionary of Cancer TermsStarts withContainsBrowse:ABCDEFGHIJKLMNOPQRSTUVWXYZ#