Retina

On the innersurface of the choroid, and closely in contactwith it, we find the internal or third and mostimportant of the ocular tunics, the retina; towhich, indeed, the other two are merely protective or containing membranes. The retina is theimmediate continuation of the optic nerve, whichextends from the brain to the eyeball, perforates the sclerotic and choroid, and immediatelyspreads out into a thin lamina over the surfaceof the latter, and is attached at two points only—at the entrance of the optic nerve and at its most anterior border, the ora serrata.

Source: Ophthalmic Dictionary including pronunciation, derivation and definition of the words used in Optometry and Ophthalmology by James J. Lewis, Oph. D. Professor of Optometry in the Northern Illinois College of Ophthalmology and Otology, Chicago.