视神经乳头 shìshénjīngrǔtóu optic disk Origin Definitions Defs Strokes Stroke Words Sentences Sents 视神经 視神經 shìshénjīng optic nerve The second pair of cranial nerves in humans and vertebrates that transmits visual information from the retina to the brain.乳头 乳頭 rǔtóu papilla a small rounded protuberance on a part of the body, such as on the skin or tongue