Unlike Alzheimer's disease, which shrinks the hippocampus causing progressive memory loss, white matter disease is a more diffuse mind-robbing condition that targets small blood vessels deep within the brain's white matter. The disease hardens the tiny arteries, gradually restricting nutrients to white matter -- the connections between brain regions involved in executive abilities such as planning, organizing, problem-solving, and attention.
The eye is a part of the nervous sytem, which is essentially a network of neurons that coordinate actions and transmits signals throughout the body. There are two parts to the â¦ nervous system: central and peripheral.he nervous system. Your eyes are part of your brain. The majority of. your brain surface is light-sensitive.
In man and other vertebrates the iris controls the amount of light entering the eye and the lens focuses the light onto the retina. 2. (often plural) the ability to see; sense of vision: weak eyes. 3. (Anatomy) the visible external part of an eye, often including the area around it: heavy-lidded eyes; piercing eyes.n man and other vertebrates the iris controls the amount of light entering the eye and the lens focuses the light onto the retina. 2. (often plural) the ability to see; sense of vision: weak eyes. 3. (Anatomy) the visible external part of an eye, often including the area around it: heavy-lidded eyes; piercing eyes.