In multiple sclerosis(MS), myelin sheath is attacked and damaged. When this happens, there is a decrease in the amount of information reaching the brain from sensory receptors. How and why does a decrease in the amount of information occur?
I know that myelin sheath speeds up the conduction of nerves by which the action potentials can jump from node to node by saltatory conduction by their local circuits; but how when this stops happening action potentials and information can be lost (I believe that it must have not decreased in information but the whole amount of information will reach the brain but slowly because of lower speed of conduction)?
I got more mixed up when I saw on a website that:
The myelin sheath prevents these impulses from escaping from the nerve at the wrong point.
Can please someone tell me how this happens? And how in the absence of myelin sheath or it being damaged, how the nerve impulse can escape from the nerve?