Characteristic clinical findings in some neurogenic myopathies and in some myogenic myopathies causing muscular weakness, hypotonia and atrophy in infancy and early childhood.

Some conditions causing neurogenic or myogenic myopathy are reviewed and illustrated by cases of 1) perinatal cervical cord injury; 2) various types of progressive spinal muscular atrophy and 3) congenital muscular dystrophy, Duchenne-like type of muscular dystrophy, limb-girdle type of muscular dystrophy. All the cases of muscular dystrophy described here occurred in girls.