Spinal muscular atrophy (SMA) is a rare genetic disorder that causes weakness. It is estimated that one in … The disease affects that part of the nervous system that controls voluntary muscle movement. 1 Depending on type and age of onset, other symptoms of SMA can include respiratory difficulties, inability to stand or walk, and problems chewing and swallowing. … Severe breathing problems are common in infant or child-onset SMA and can contribute to a reduced life expectancy.
Type I-III spinal muscular atrophy (SMA) is caused by alterations in the survival motor neuron gene (SMN).

Spinal muscular atrophy type III is also called Kugelberg-Welander disease or Juvenile Spinal Muscular Atrophy. It affects motor neurons in the spinal cord, resulting in weakness of the muscles used for movement. Spinal Muscular Atrophy (SMA) is a rare, genetically inherited neuromuscular condition. This is a mild form of SMA that typically causes muscle weakness after early childhood, from 18 months to early adulthood. The muscles don’t receive signals from these nerve cells that are located near the spinal cord and as a result the muscles begin to waste away. It causes progressive muscle weakness and loss of movement due to muscle wasting ( atrophy ). This may affect crawling and walking ability, arm, hand, head and neck movement, breathing and swallowing. Individuals with this condition can stand and walk unaided, but may have trouble getting up from sitting position. Spinal muscular atrophy (SMA) is a neurological condition characterized by muscle weakness and atrophy (shrinking of the muscles) that affects one in 8,000–10,000 people. Types 2 and 3 are the next most common. Spinal muscular atrophy (SMA) is a genetic neuromuscular disorder characterized by muscle weakness that worsens over time. Of the five SMA types, type 1 is the most common—about 50% of people with SMA have it. As such, doctors classify the disorder by type. You can also develop breathing problems or have a physical injury due to the muscle weakness of SMA. Spinal Muscular Atrophy Types and Symptoms. Spinal muscular atrophy can present at different ages and feature different symptoms and levels of severity. It is a one of the most common genetic conditions affecting children. Spinal muscular atrophy or SMA is a genetic disease that affects the nervous system. Spinal muscular atrophy (SMA) is a group of genetic diseases that cause weakness and wasting in the voluntary muscles of infants and children and, more rarely, in adults. Type 4 is the least … Type 0 is the second least common type of SMA.

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