Myasthenia gravis is caused by an error in the transmission of nerve impulses to muscles. It occurs when normal communication between the nerve and muscle is interrupted at the neuromuscular junction, the place where nerve cells connect with the muscles they control.
A mental disorder is any disorder that affects the function of the brain making the patient incapable of normal life behavorior. Depression, anxiety, dementia and Schizophrenia are just a few. A mental disorder interrupts the normal function of the brain cause a multitude of issues and conditions. In order for a condition to be labeled mental disorder the condition has to cause dysfunction in the patients life.
