The term âcatapultâ is used to define a very wide variety of large machines for hurling projectiles and some of the more common variations include the trebuchet, which is a catapult that uses gravity and a seesaw effect to hurl its projectile.
A demyelinating disease is any condition that results in damage to the protective covering (myelin sheath) that surrounds nerve fibers in your brain and spinal cord.
Below are various methods/techniques used to diagnose demyelinating diseases. 1  Exclusion of other conditions that have overlapping symptoms. 2  Magnetic resonance imaging (MRI) is a medical imaging technique used in radiology to visualize internal structures of the body in detail.