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.
1 The iris of the eye functions like the diaphragm of a camera, controlling the amount of light reaching the back of the eye by automatically adjusting the size of the pupil (aperture). 2  The eye's crystalline lens is located directly behind the pupil and further focuses light.ther parts of the human eye play a supporting role in the main activity of sight: 1  Some carry fluids (such as tears and blood) to lubricate or nourish the eye. 2  Others are muscles that allow the eye to move. 3  Some parts protect the eye from injury (such as the lids and the epithelium of the cornea).