Provide information regarding disorders of the skeletal and muscular system.

(N/A) - $Myasthenia$ $gravis$: It is an autoimmune disorder affecting the neuromuscular junction,leading to fatigue,weakening,and paralysis of skeletal muscle.
- $Muscular$ $dystrophy$: Progressive degeneration of skeletal muscle,mostly due to a genetic disorder.
- $Tetany$: Rapid spasms (wild contractions) in muscle due to low $Ca^{++}$ levels in body fluid.
- $Arthritis$: Inflammation of joints.
- $Osteoporosis$: An age-related disorder characterized by decreased bone mass and increased chances of fractures. Decreased levels of estrogen is a common cause.
- $Gout$: Inflammation of joints due to the accumulation of uric acid crystals.