What term describes a group of hereditary neuromuscular disorders characterized by progressive muscle weakness and degeneration?

• A. Spinal Muscular Atrophy
• B. Myopathy with hypotonia
• C. Amyotrophic Lateral Sclerosis
• D. Muscular Dystrophy (MD)

Answer: (D)

The idea being tested is a group of inherited conditions in which the muscles themselves progressively weaken and deteriorate due to defects in muscle-structural proteins. Muscular dystrophy fits this description because it refers to a family of inherited disorders (like Duchenne/Becker, limb-girdle, and others) where muscle fibers progressively degenerate and are replaced by fat and connective tissue, leading to increasing weakness over time.

Spinal muscular atrophy, by contrast, is driven by motor neuron degeneration rather than primary muscle degeneration. Myopathy with hypotonia is a broad descriptor of muscle-related weakness that isn’t specifically the progressive, hereditary muscle-structure disorder described here. Amyotrophic lateral sclerosis is a motor neuron disease often not categorized as a hereditary muscular dystrophy. So, muscular dystrophy is the best match for a group of hereditary neuromuscular disorders with progressive muscle weakness and degeneration.