INTERNAL ARCHITECTURE: NADH STAIN
Normal internal architecture: Adult
Muscle fibers: Type correspondence
Darkest fibers: Type I
Palest fibers: Type 2A
Intermediate fibers: Type 2B
Normal internal architecture: Child
Staining patterns: Coarser than in adults
Neonate: 1 week of age
Infant: 1 year of age
Immature (Regenerating) muscle fibers
Internal architecture: Coarser and darker than in normal fibers in adults
Size: Often intermediate
Shape: Polygonal or Rounded
Linearization of sarcoplasmic membranes in pale (Type 2) muscle fibers
Clinical correlations
Mostly non-specific
Common, & more severe, in:
Myophosphorylase deficiency &
Glycogen storage.
Internal architecture: Linear (White arrow) & less punctate compared to control muscle fibers (Dark arrow)
Linearization of Internal architecture: More severe
Dark streaks of NADH staining in paler (Type 2) muscle fibers
Linearization of internal architecture
Mostly in paler fibers
One small dartk muscle fiber is a pyknotic nuclear clump (from denervation without reinnervation
Linearization of Internal architecture: Other stains
Linearization: Visible as cracks in type 2 (Darker stained) muscle fibers
ATPase pH 9.4 stain
|
Linearization: Visible as black-stained linear regions in muscle fibers
VvG stain
|
Motheaten muscle fibers
NADH stain
|
Lobulated Muscle Fibers
Abnormal internal architecture: Moth-eaten & Lobulated muscle fibers
Dark, irregularly stained fibers are:
Moth-eaten,
Lobulated or
Trabecular
More common in type 1 muscle fibers
May occur in myopathy or neuropathy.
Myopathies commonly with lobulated fibers:
LGMD 2A;
Ullrich CMD;
Bethlem myopathy
NADH stain
|
Lobulated Muscle Fibers: Patient with cachexia & muscle fiber atrophy
NADH stain
|
NADH stain
|
Lobulated Muscle fibers
NADH stain
|
Lobulated Muscle Fibers: Other stains
VvG stain
|
Cachexia: Abnormal nuclear morphology
Congo red stain
|
See
NADH stain methodology
Return to
Neuromuscular Home Page
Return to
Pathology index
11/24/2022