what is sma muscular
What is spinal muscular atrophy (SMA)? SMA is a rare genetic neuromuscular disease that affects the part of the nervous system that controls voluntary muscle movement. In spinal muscular atrophy, there is a loss of important cells in the spinal cord called motor neurons, which are essential for muscle strength and movement.
spinal muscular atrophy. Description. Spinal muscular atrophy is a genetic disorder that affects the control of muscle movement. It is caused by a loss of specialized nerve cells, called motor neurons, in the spinal cord and the part of the brain that is connected to the spinal cord (the brainstem).