MS is a common chronic demyelinating disease affecting central nervous system. Most common in young adults, with peak onset at 35 years. Strong female predilection with 2:1 F:M ratio. Geographic distribution increases from equator to poles
SNS links brain/spinal cord to skeletal muscles under conscious control. System consists of 43 nerve segments, 31 in spinal cord and 12 in brain stem. Contains both afferent (sensory) and efferent (motor) nerve fibers
PSP is a late-onset neurodegenerative disease affecting brain volumes. Affects about six people per 100,000, typically starting at 60-70 years. Males are slightly more likely to be affected than females
GBS is a rare neurological disorder where immune system attacks peripheral nerves. Symptoms typically start suddenly and worsen over hours to weeks. Weakness often affects feet first, progressing to arms, face, and breathing muscles. Can cause tingling, pain, and difficulty swallowing
Ulnar nerve supplies upper extremities and travels from brachial plexus. Nerves carry signals between brain and body for sensation and movement
Ganglia are clusters of nerve cell bodies located throughout the body. Sensory ganglia are ovoid with circular nuclei, found in spinal nerves. Motor ganglia form chains in spine, controlling involuntary functions. Basal ganglia are CNS structures located in brain stem and cortex