The optic nerve, which is a collection of retinal nerve fibers, conducts the electrical impulses to the optic chasm of the brain, according to the Vision for Tomorrow Foundation. Half of the retinal nerve fibers from each retina's inner half cross to the other side of the brain. The nerve fibers meet at the occipital lobe in the back of the brain. Vision is interpreted by the brain in the primary visual cortex. Each rod and cone, which are photoreceptors, in the retina is connected to the optic nerve by a tiny nerve branch, according to the Merck Manual Home Edition.
The equator is located at zero degrees latitude. The equator runs through Indonesia, Ecuador, northern Brazil, the Democratic Republic of the Congo, and Kenya, among other countries.
The figure to the right shows several parallels of latitude. Latitude goes for 0Â° at the equator to +90Â° N at the North Pole or -90Â° S at the South Pole where the angle is also measured from the center of the earth as shown in the earth graphic to the right. There are a few named parallels of latitude.