NCI Dictionary of Cancer Terms The NCI Dictionary of Cancer Terms features 7,940 terms related to cancer and medicine. The search textbox has an autosuggest feature. When you enter three or more characters, a list of up to 10 suggestions will popup under the textbox. Use the arrow keys to move through the suggestions. To select a suggestion, hit the enter key. Using the escape key closes the listbox and puts you back at the textbox. The radio buttons allow you to toggle between having all search items start with or contain the text you entered in the search box. Starts with Contains Browse: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # optic nerve listen (OP-tik nerv) The nerve that carries messages from the retina to the brain. Enlarge Anatomy of the eye, showing the outside and inside of the eye including the eyelid, pupil, sclera, iris, cornea, lens, ciliary body, retina, choroid, vitreous humor, and optic nerve. Enlarge Anatomy 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.