Pronunciation: (REH-tih-nuh)

The light-sensitive layers of nerve tissue at the back of the eye that receive images and sends them as electric signals through the optic nerve to the brain.

Source: NCI Dictionary of Cancer Terms

Caption: 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.

2005-08-24 Date last modified: 2007-09-28