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Structured Motor Rehabilitation After Selective Nerve Transfers
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Upper Extremity Innervation Patterns and Clinical Implications for Nerve and Tendon Transfer.

Ellen Y Lee1,2, Sandeep J Sebastin1,2, Andre Cheah1,2

  • 1Singapore.

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|August 19, 2017
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Summary
This summary is machine-generated.

This study maps upper limb motor nerve branches, revealing clusters near muscle origins. This neuromuscular blueprint aids reconstructive surgery by identifying muscles suitable for independent compartment splitting.

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Area of Science:

  • Anatomy
  • Neuroscience
  • Surgical Anatomy

Background:

  • Previous work identified intramuscular innervation patterns enabling independent muscle compartments.
  • This study focuses on the extramuscular course and branching of peripheral nerves in the upper limb.

Purpose of the Study:

  • To map the location, extramuscular course, and number of motor nerve branches of upper limb peripheral nerves.
  • To integrate this data with prior intramuscular innervation findings to create a comprehensive neuromuscular blueprint for reconstructive surgery.

Main Methods:

  • Dissection of ten fresh frozen cadaveric upper limbs.
  • Determination of motor nerve branch origins, extramuscular course, and number of nerves per muscle.
  • Review of Sihler-stained muscle images from previous intramuscular innervation studies.

Main Results:

  • Motor nerve branches originate at the nerve trunk-muscle belly junction, clustered near muscle group origins.
  • Two patterns of extramuscular innervation were observed: single motor nerve and multiple motor nerves.
  • A revised muscle classification was proposed based on fiber orientation, compartment number, and origin/insertion characteristics.

Conclusions:

  • Motor nerve clusters are identifiable using fixed anatomical landmarks.
  • Muscles with multiple motor nerves possess morphology suitable for compartmentalization.
  • A detailed muscle and nerve blueprint was developed to guide nerve and split muscle transfer procedures in reconstructive surgery.