NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,791 terms related to cancer and medicine.

Browse the dictionary by selecting a letter of the alphabet or by entering a cancer-related word or phrase in the search box.

central nervous system
(SEN-trul NER-vus SIS-tem)
The brain and spinal cord. Also called CNS.

EnlargeDrawing of brain anatomy showing the brain stem, pons, medulla, spinal cord, cerebellum, cerebrum, meninges, ventricles (fluid-filled spaces), and skull.

Anatomy of the brain, showing the cerebrum, cerebellum, brain stem, and other parts of the brain.