Which of the following is classified as a muscular system pathology?

Fibromyalgia is classified as a muscular system pathology because it primarily affects the soft tissues and muscles, causing widespread pain, tenderness, and fatigue. This condition involves the central nervous system and is characterized by an abnormal pain response, leading to heightened sensitivity to pain and pressure in muscles and connective tissues.

Understanding fibromyalgia helps in recognizing it as a disorder of muscle function rather than a structural issue, which distinguishes it from conditions like scoliosis, osteoporosis, or herniation. Scoliosis involves a curvature of the spine, primarily a skeletal issue, while osteoporosis relates to bone density and structural integrity. Herniation generally refers to issues in the spine or between vertebrae, affecting nerves rather than directly implicating the muscular system itself. Thus, fibromyalgia stands out as a direct disorder affecting the muscles.