The third McMinnville MS Walk is scheduled for this Saturday around the walking trail at the Civic Center. The walk is a way to show McMinnville is moving toward a cure for multiple sclerosis (MS) and is a fundraiser for MS research.MS is a chronic, often disabling, disease that attacks the central nervous system which is made up of the brain, spinal cord, and optic nerves. Symptoms vary from mild, such as numbness in the limbs, to severe, such as paralysis or loss of vision.Local resident and MS Walk organizer Heather George was diagnosed with MS in 2007.