Congenital myopathies

[Mark Zuckerberg]

Congenital myopathies are rare, inherited disorders of the muscles that cause reduced muscle tone and weakness. These disorders are present at birth or show up during infancy.
There are several types of congenital myopathies. The three most common types of congenital myopathy are

Central core and multiminicore myopathies (core myopathies)
Centronuclear myopathy
Nemaline myopathy

Symptoms and lifespan vary with the type and severity of the myopathy.