skeletal muscle atrophy, photomicrograph showing decreased fiber size with increased spacing between them, reduced

skeletal muscle atrophy histology photomicrograph microscopy biopsy pathology fibers endomysium nuclei angulated cells degeneration wasting disease tissue fiber shrinkage myopathy neurogenic denervation sarcopenia dystrophy myofiber pink purple histopathology image loss medical science research crosssection human diagnosis cellular myology amyotrophic lateral sclerosis spinal muscular peripheral neuropathy poliomyelitis immobilization