The Brain 109
Input
4 Retinal rods and cones
Pulvinar Lateral geniculate body Superior Colliculus Medial geniculate body
Cortex of Occipital Lobes
Visual Processing System
brain. The impulses split and form two distinct paths, one through the cerebral cortex, which gives us the sensation of conscious vision, and the other into the lower brain which provides us with instinctive reactions.
The right hand side of your body is connected to the left hemisphere of the brain and vice versa. This means each hand is controlled by the opposite side of the brain. But, your eyes see both your hands. To resolve this conundrum a very complex thing has to happen to the optic nerve in the center of the brain. The optic nerve from each eye splits and crosses over in the middle, so the left side of the left eye and the left side of the right eye goes to the right hand side of the brain and vice versa. This keeps the brain focused on the correct hand.
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