<prompt> All of the following are associated with proximal muscle weakness exceptSpinomuscular atrophyDuchenis muscular dystrophyPolymyositisMyotonic dystrophy  <response>: The general rule in that :Myopathies have proximal muscle weakness.Neuropathies have distal muscle weakness.Myotonic dystrophy is an exception to this general rule and mainly involves the distal muscles. Also, knowThe difference between myopathy and muscular dystrophy.MyopathyAny skeletal muscle disorder that causes structural changes or functional impairment of muscle. It also includes muscular dystrophies.Muscular dystrophyThe muscular dystrophy means an abnormal growth of muscle.It is characterized by -It is a primary myopathy It has a genetic basis Course is progressive Degeneration Death of muscle fibres occur at some stage of the disease So, muscular dystrophy is a type of myopathy. 