CNS

"The central nervous system (CNS) is composed of the brain and spinal cord. The brain receives sensory information from the nerves that pass through the spinal cord, as well as other nerves such as those from sensory organs involved in sight and smell. Once received, the brain processes the sensory signals and initiates responses. The spinal cord is the principle route for the passage of sensory information to and from the brain.
Information flows to the central nervous system from the peripheral nervous system , which senses signals from the environment outside the body (sensory-somatic nervous system) and from the internal environment (autonomic nervous system). The brain's responses to incoming information flow through the spinal cord nerve network to the various effector organs and tissue regions where the target responsive action will take place. Diseases that affect the nerves of the central nervous system include rabies, polio, and sub-acute sclerosing pan-encephalitis. Such diseases affect movement and can lead to mental incapacitation. The brain is also susceptible to disease, including toxoplasmosis and the development of empty region due to prions. Such diseases cause a wasting away of body function and mental ability. Brain damage can be so compromised as to be lethal."

Gait abnormality

Walking abnormalities are unusual and uncontrollable walking patterns that are usually due to diseases or injuries to the legs, feet, brain, spinal cord, or inner ear. The pattern of how a person walks is called the gait. Many different types of walking problems occur without a person's control. Most, but not all, are due to some physical condition. Some walking abnormalities have been given names:
1. Propulsive gait -- a stooped, stiff posture with the head and neck bent forward
2. Scissors gait -- legs flexed slightly at the hips and knees like crouching, with the knees and thighs hitting or crossing in a scissors-like movement
3. Spastic gait -- a stiff, foot-dragging walk caused by a long muscle contraction on one side