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Some aspects of lumbrical function.

N Citron1, A Foster

  • 1Royal National Orthopaedic Hospital, London.

Journal of Hand Surgery (Edinburgh, Scotland)
|February 1, 1988
PubMed
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Electromyography revealed that the flexor digitorum profundus muscle may stabilize the lumbrical muscle's origin during resisted hand extension, enhancing lumbrical efficiency in some individuals.

Area of Science:

  • Biomechanics
  • Human Anatomy
  • Neurophysiology

Background:

  • The intrinsic and extrinsic muscles of the hand play crucial roles in fine motor control and grip strength.
  • Understanding the synergistic and antagonistic actions of these muscles is essential for diagnosing and treating hand pathologies.

Purpose of the Study:

  • To investigate the electromyographic activity of the lumbrical and flexor digitorum profundus muscles during hand extension.
  • To determine the functional relationship between these muscles under resisted and unresisted conditions.

Main Methods:

  • Electromyography (EMG) was utilized to record muscle activity.
  • Six healthy volunteers participated in the study.
  • Muscle activation patterns were analyzed during resisted and unresisted interphalangeal joint extension.

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Main Results:

  • Minimal simultaneous contraction between lumbrical and flexor digitorum profundus muscles was observed during unresisted extension.
  • Significant simultaneous contraction of both muscles was noted in several subjects during resisted extension.
  • This suggests a potential stabilizing role for the flexor digitorum profundus.

Conclusions:

  • The flexor digitorum profundus may act to stabilize the lumbrical muscle's origin during resisted extension.
  • This stabilization could enhance the lumbrical muscle's efficiency in specific functional tasks.
  • Further research is warranted to elucidate the precise neuromuscular control mechanisms of the hand.