title: Axon Counts Yield Multiple Options for Triceps Fascicular Nerve to Axillary Nerve Transfer.
abstract: OBJECTIVE
  To evaluate the relative axonal match between potential donor and recipient nerves, so that maximal reinnervation potential may be reached with the least chance of donor site morbidity.
  
  
  METHODS
  In 10 fresh-frozen cadaveric specimens, the main trunk and anterior, posterior, sensory and teres minor branches of the axillary nerve were identified, as were the radial nerve branches to the long, medial, and lateral heads of the triceps. The swing distances of the triceps fascicular nerve branches and the axillary nerve branches relative to the inferior border of the teres major muscle were recorded. Histomorphological analysis and axon counts were performed on sections of each branch.
  
  
  RESULTS
  The median number of axons in the main axillary trunk was 7,887, with 4,052, 1,242, and 1,161 axons in the anterior, posterior, and teres minor branches, respectively. All specimens had a single long head triceps branch (median, 2,302 axons), a range of 1 to 3 branches to the medial head of the triceps (composite axon count, 2,198 axons), and 1 to 3 branches to the lateral head of the triceps (composite average, 1,462 axons). The medial and lateral head branches had sufficient swing distance to reach the anterior branch of the axillary nerve in all 10 specimens, with only 4 specimens having adequate long head branch swing distances.
  
  
  CONCLUSIONS
  It is anatomically feasible to transfer multiple branches of the radial nerve supplying the medial, lateral, and sometimes, long head of the triceps to all branches of the axillary nerve in an attempt to reinnervate the deltoid and teres minor muscles.
  
  
  CONCLUSIONS
  Understanding the axon counts of the different possible transfer combinations will improve operative flexibility and enable peripheral nerve surgeons to reinnervate for both abduction and external rotation with the highest donor/recipient axon count ratios.
authors: Hand and Upper Extremity Center for Brachial Plexus and Traumatic Nerve Injury, Hospital for Special Surgery, New York, NY. Electronic address: mkhair@carrellclinic.com.
authors: M Michael
authors: MM
authors: Khair
authors: Hand and Upper Extremity Center for Brachial Plexus and Traumatic Nerve Injury, Hospital for Special Surgery, New York, NY.
authors: Joseph J
authors: JJ
authors: Schreiber
authors: Hand and Upper Extremity Center for Brachial Plexus and Traumatic Nerve Injury, Hospital for Special Surgery, New York, NY.
authors: Lauren
authors: L
authors: Rosenblatt
authors: Hand and Upper Extremity Center for Brachial Plexus and Traumatic Nerve Injury, Hospital for Special Surgery, New York, NY.
authors: David J
authors: DJ
authors: Byun
authors: Hand and Upper Extremity Center for Brachial Plexus and Traumatic Nerve Injury, Hospital for Special Surgery, New York, NY.
authors: Steve K
authors: SK
authors: Lee
authors: Hand and Upper Extremity Center for Brachial Plexus and Traumatic Nerve Injury, Hospital for Special Surgery, New York, NY.
authors: Scott W
authors: SW
authors: Wolfe
mesh_terms: D001365:Axilla / Q000294:innervation*; D001369:Axons; D001917:Brachial Plexus / Q000601:surgery; D006801:Humans; D018482:Muscle, Skeletal / Q000294:innervation*; D016067:Nerve Transfer / Q000379:methods*; D011826:Radial Nerve / Q000166:cytology / Q000637:transplantation*
keywords: Brachial plexus; axillary nerve; nerve injury; nerve transfer; radial nerve