Structure:
The optic nerve is an extension of the brain tissue to the eyeball where
it connects with the rods and cones of the retina. The nerve is branched,
with a midline crossing of one-half of the nerve fibers from each side
to the other.
Function:
The optic nerve is the structure that gathers and delivers the visual images
to the visual cortex of the cerebrum. Control
of the iris muscle, determining the size of the pupil, is inder the action
of the sympathetic nervous system.
