The nervous system is composed of neurons or nerve cells and their supporting structures. Types of Neurons There are three classes of neurons; each class corresponds to a different aspect of nervous system function. Sensory Neurons. Sensory or afferent neurons are specialized to detect stimuli and transmit information about them to the central nervous system. These neurons may connect any organ to the central nervous system. A stimulus is a change in the environment; it may be light, heat, pressure, or a chemical, for example.
Although there have been no general studies of life expectancy in people with cerebral palsy, most children affected by CP live between 30 and 70 years, depending on the severity of the condition.
Some degree of cerebral shrinkage occurs naturally with age; after the brain completes growth and attains its maximum mass at around age 25, it gradually loses mass with each decade of life, although the rate of loss is comparatively tiny until the age of 60, when approximately .5 to 1% of brain volume is lost per year.ome degree of cerebral shrinkage occurs naturally with age; after the brain completes growth and attains its maximum mass at around age 25, it gradually loses mass with each decade of life, although the rate of loss is comparatively tiny until the age of 60, when approximately .5 to 1% of brain volume is lost per year.