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The thenar muscles. New findings.

S Van Sint Jan1, M Rooze

  • 1Laboratory of Functional Anatomy, University of Brussels, Belgium.

Surgical and Radiologic Anatomy : SRA
|January 1, 1992
PubMed
Summary

Anatomical study reveals variations in thumb muscles, including multiple bellies and varied insertions for abductor pollicis brevis, opponens pollicis, and adductor pollicis. These findings may impact thumb proprioception.

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Area of Science:

  • Anatomy
  • Musculoskeletal System
  • Human Anatomy

Background:

  • The thenar muscles are crucial for thumb function and dexterity.
  • Understanding the detailed anatomy of these muscles is essential for clinical applications and understanding biomechanics.

Purpose of the Study:

  • To investigate the anatomical variations of the thenar muscles in the human hand.
  • To describe the number and insertions of muscle bellies in the abductor pollicis brevis, opponens pollicis, and adductor pollicis.
  • To explore the relationship between the abductor pollicis brevis and the abductor pollicis longus.

Main Methods:

  • Dissection of 30 anatomical hand preparations.
  • Detailed examination of the thenar muscle groups: abductor pollicis brevis, opponens pollicis, adductor pollicis, and flexor pollicis brevis.
  • Observation and documentation of muscle belly variations and their insertions.

Main Results:

  • The abductor pollicis brevis, opponens pollicis, and adductor pollicis muscles were found to consist of multiple muscle bellies with variable numbers and insertions.
  • The flexor pollicis brevis exhibited variability, with its heads not originating from a specific muscle belly.
  • A relationship was observed between the abductor pollicis brevis and the presence of a tendinous slip from the abductor pollicis longus.

Conclusions:

  • Significant anatomical variations exist within the thenar muscles, particularly in the number and arrangement of muscle bellies and their insertions.
  • These anatomical variations, including the association with the abductor pollicis longus, may influence proprioception within the thumb ray.
  • Further research is warranted to elucidate the functional implications of these anatomical variations on thumb biomechanics and sensory feedback.

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