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Spinal muscular atrophy (SMA) is a rare neuromuscular disorder that results in the loss of motor neurons and progressive muscle wasting. [ 3 ] [ 4 ] [ 5 ] It is usually diagnosed in infancy or early childhood and if left untreated it is the most common genetic cause of infant death. [ 6 ]
(C) There is upper limb and truncal muscle atrophy with a positive Babinski sign. (D) Advanced thenar muscle atrophy. [8] Signs and symptoms depend on the specific disease, but motor neuron diseases typically manifest as a group of movement-related symptoms. [6] They come on slowly, and worsen over the course of more than three months.
Autosomal recessive proximal spinal muscular atrophy, responsible for 90-95% of cases and usually called simply spinal muscular atrophy (SMA) – a disorder associated with a genetic mutation on the SMN1 gene on chromosome 5q (locus 5q13), diagnosed predominantly in young children and in its most severe form being the most common genetic cause ...
Spinal and bulbar muscular atrophy (SBMA), popularly known as Kennedy's disease, is a rare, adult-onset, X-linked recessive lower motor neuron disease caused by trinucleotide CAG repeat expansions in exon 1 of the androgen receptor (AR) gene, which results in both loss of AR function and toxic gain of function. [2] [3]
X-linked spinal muscular atrophy type 2 (SMAX2, XLSMA), also known as arthrogryposis multiplex congenita X-linked type 1 (AMCX1), is a rare neurological disorder involving death of motor neurons in the anterior horn of spinal cord resulting in generalised muscle wasting .
DSMA1 was identified and classified as a sub-group of spinal muscular atrophies (SMA) in 1974. [3] Currently, various classifications include DSMA1 either among spinal muscular atrophies or among distal hereditary motor neuropathies, though the latter has been argued to be more correct. [4]
When you repeat a movement—like lifting weights or nailing a yoga pose—the body’s motor control center (which includes the premotor cortex, cerebellum, and spinal cord) is hard at work ...
The first symptoms include muscle cramps and muscle twitches affecting the upper and lower limbs. They appear usually after age of 40. The disease is slowly progressive with adult onset and results in weakness and mild muscle atrophy. [1] [3] The disease does not affect life expectancy. [1]
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