Skeletal muscle

Skeletal muscle. HPS stain. (WC/Nephron)

Skeletal muscle is a type of striated muscle under voluntary control.

Muscle biopsies are dealt with in the article neuromuscular pathology.

General

• Common incidental finding on biopsies and resections.

Anatomy and histology

See Neuromuscular pathology#Muscle structure/histology

Microscopic

Features:

• Long fibres with striations - key feature.
  • Striations may be difficult to appreciate on cytology.
• Peripheral nuclei.

DDx:

• Colloid - especially on cytology.

Images

Cytology

• 
  SM - intermed. mag.
• 
  SM - high mag.
• 
  SM - very high mag.
• 
  SM - very high mag.
• 
  SM - high mag.
• 
  SM - high mag.
• 
  SM - very high mag.
• 
  SM - very high mag.

See also

• Head and neck cytopathology.
• Muscle biopsy.