juvenile muscular atrophy - meaning and definition. What is juvenile muscular atrophy
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What (who) is juvenile muscular atrophy - definition

GROUP OF DISEASES
Spinomuscular atrophy; Infantile Spinal Muscular Atrophy; Intermediate Spinal Muscular Atrophy; Spinal muscle atrophy; SMAs

Spinal muscular atrophies         
Spinal muscular atrophies (SMAs) are a genetically and clinically heterogeneous group of rare debilitating disorders characterised by the degeneration of lower motor neurons (neuronal cells situated in the anterior horn of the spinal cord) and subsequent atrophy (wasting) of various muscle groups in the body. While some SMAs lead to early infant death, other diseases of this group permit normal adult life with only mild weakness.
Progressive muscular atrophy         
A RARE, MILDER FORM OF AMYOTROPHIC LATERAL SCLEROSIS. IT IS CHARACTERIZED BY A SLOWLY PROGRESSIVE CLINICAL COURSE. SIGNS AND SYMPTOMS INCLUDE MUSCLE WEAKNESS, ATROPHY, AND FASCICULATION.
Progressive spinal muscular atrophy; Aran-Duchénne disease; Cruveilhier's disease; Duchenne-Aran disease; Duchenne–Aran disease
Progressive muscular atrophy (PMA), also called Duchenne–Aran disease and Duchenne–Aran muscular atrophy, is a disorder characterised by the degeneration of lower motor neurons, resulting in generalised, progressive loss of muscle function.
Jokela type spinal muscular atrophy         
NEUROMUSCULAR DISEASE
Jokela-type spinal muscular atrophy; LOSMoN; Late-onset spinal motor neuronopathy
Jokela type spinal muscular atrophy (SMAJ), also known as late-onset spinal motor neuronopathy (LOSMoN), is an ultra-rare neuromuscular disorder characterized by muscle twitches and cramps. The symptoms appear in adulthood and gradually progress.

Wikipedia

Spinal muscular atrophies

Spinal muscular atrophies (SMAs) are a genetically and clinically heterogeneous group of rare debilitating disorders characterised by the degeneration of lower motor neurons (neuronal cells situated in the anterior horn of the spinal cord) and subsequent atrophy (wasting) of various muscle groups in the body. While some SMAs lead to early infant death, other diseases of this group permit normal adult life with only mild weakness.