Explain the common clinical signs of "multiple sclerosis" (MS) in humans.
Signs or symptoms of Multiple Sclerosis are varied. This disease affects the myelin sheaths, or fatty covering outside the nerve cells. The symptoms for M.S. are many. Involuntary eye movements, an electrical sensation when bending the neck and sensitivity to temperatures are some of the symptoms. Muscle weakness, difficulty with balance and coordination, depression, changes in mood are more symptoms. There may be difficulty when swallowing and there may be muscle spasms. With M.S., sometimes, these symptoms can disappear during periods of remission and return much later. Treatment aims at restoring function after an attack, however, there is no cure. Life expectancy is no different than someone without the disease.