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Summary

Microscopic analysis of the frontalis muscle revealed collagen XXII at insertion sites without tendons, and neuromuscular junctions indicating potential afferent nerve fibers. This study details the frontalis muscle

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Area of Science:

  • Anatomy
  • Histology
  • Neuroscience

Background:

  • The frontalis muscle's clinical significance necessitates understanding its microscopic structure and innervation.
  • Previous suggestions regarding afferent innervation prompted a detailed microscopic investigation.

Purpose of the Study:

  • To investigate the microscopic appearance of the frontalis muscle.
  • To clarify the presence and location of neuromuscular junctions and collagen XXII expression.

Main Methods:

  • Serial sections of the frontalis muscle from seven human cadavers were examined using light microscopy.
  • Immunohistochemistry was performed using antibodies for collagen XXII and neurofilament.

Main Results:

  • Collagen XXII, a marker for myotendinous junctions, was expressed at muscle fiber endings at both insertion sides, despite the absence of tendons at the origin.
  • Neuromuscular junctions were identified in the muscle belly and cranial portion, suggesting potential afferent nerve fiber pathways.

Conclusions:

  • This study provides a detailed microscopic description of the frontalis muscle.
  • It demonstrates collagen XXII expression in the absence of tendon formation, a novel finding.
  • The study confirms the lack of corpuscular afferent neuronal structures within the frontalis muscle.