Comunicação entre os nervos musculocutâneo e mediano no braço: estudo anatômico e implicações clínicas

Translated title of the contribution: Communication between the musculocutaneous and median nerves in the arm: An anatomical study and clinical implications

Luis Ernesto Ballesteros, Pedro Luis Forero, Edna Rocío Buitrago

Research output: Articles / NotesScientific Articlepeer-review

13 Scopus citations

Abstract

Objective To determine the frequency and features of communication between the musculocutaneous nerve (MCN) and median nerve (MN) in a sample of the Colombian population, and assess its clinical implication. Methods The arms of 53 cadaver specimens that had been subjected to necropsy at the National Institute of Forensic Medicine, in Bucaramanga, Colombia, were studied. The structures of the anterior compartment of the arm were dissected and characterized regarding the presence of communication between the MCN and MN. Results A communicating branch was found in 21/106 upper limbs (19.8%), occurring bilaterally in 10 (47.6%) and unilaterally in 11 (52.4%), without significant difference regarding the side of occurrence (p = 0.30). In 17% of the cases, there was MCN-MN communication in which the communicating branch was seen leaving the MCN after piercing the coracobrachialis muscle (Type I). In 2.8%, the connection was from the MN to the MCN (Type II). The length of the communicating branch was 57.8 ± 33.4 mm. The distances from the proximal and distal points of this branch to the coracoid process were 138 ± 39.4 mm and 188 ± 48.3 mm, respectively. The communicating branch was located mostly in the middle third of the arm. Conclusions The frequency of MCN-MN communication observed in the present study is in the middle of the range of what was reported in previous studies. MCN-MN connections need to be taken into account in diagnosing and managing peripheral nerve lesions of the upper limbs.

Translated title of the contributionCommunication between the musculocutaneous and median nerves in the arm: An anatomical study and clinical implications
Original languagePortuguese
Pages (from-to)567-572
Number of pages6
JournalRevista Brasileira de Ortopedia
Volume50
Issue number5
DOIs
StatePublished - 1 Sep 2015
Externally publishedYes

Keywords

  • Communication
  • Median nerve
  • Musculocutaneous nerve

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