What neurological disorder is characterized by weakness in skeletal muscles?

Myasthenia gravis is an autoimmune neuromuscular disorder that leads to weakness in skeletal muscles. The condition occurs when the immune system produces antibodies that interfere with the communication between nerves and muscles. This results in varying degrees of skeletal muscle weakness that can worsen with activity and improve with rest.

In myasthenia gravis, muscle groups such as those involved in eye movement, facial expression, and swallowing are often affected, leading to symptoms like drooping eyelids and difficulty with speaking or swallowing. The hallmark of this disorder is muscle fatigue that increases with repeated use, which distinguishes it from other neurological disorders that may present with different types of weakness or symptoms.

The other conditions mentioned in the list present with different mechanisms and symptoms. For instance, multiple sclerosis involves the degradation of myelin in the central nervous system, leading to a wide range of neurological deficits, and does not specifically focus on muscle weakness as its primary feature. Parkinson's disease primarily affects motor control and results in symptoms like tremors and rigidity, not defined by muscle weakness alone. Guillain-Barre syndrome is characterized by acute, rapid-onset muscle weakness due to peripheral nerve demyelination, which can be severe but differs in its pathophysiology and presentation compared