Rare anatomical variation of the musculocutaneous nerve – case ... [PDF]

Em uma dissecação de rotina do membro superior direito de um cadáver masculino observamos uma variação anatômica d

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Revista Brasileira de Ortopedia (English Edition) Volume 51, Issue 3, May–June 2016, Pages 366-369 open access

Case Report

Rare anatomical variation of the musculocutaneous nerve – case report Rara variação anatômica do nervo musculocutâneo – relato de caso Sergio Ricardo Rios Nascimento

, Cristiane Regina Ruiz , Eduardo Pereira, Lilian Andrades , Cristiano Cirqueira de Souza

Show more https://doi.org/10.1016/j.rboe.2015.08.019

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Open Access funded by Sociedade Brasileira de Ortopedia e Traumatologia Under a Creative Commons license

Abstract The clinical and surgical importance of anatomical knowledge of the musculocutaneous nerve and its variations is due to the fact that one of the complications in many upper-limb surgical procedures involves injury to this nerve. During routine dissection of the right upper limb of a male cadaver, we observed an anatomical variation of this nerve. The musculocutaneous nerve originated in the lateral cord and continued laterally, passing under the coracobrachialis muscle and then continuing until its first branch to the biceps brachialis muscle. Just after this, it supplied another two branches, i.e. the lateral cutaneous nerve of the forearm and a branch to the brachialis muscle, and then it joined the median nerve. The median nerve followed the arm medially to the region of the cubital fossa and then gave rise to the anterior intermediate nerve of the forearm. The union between the musculocutaneous nerve and the median nerve occurred approximately at the midpoint of the arm and the median nerve. Given that either our example is not covered by the classifications found in the literature or that it fits into more than one variation proposed, without us finding something truly similar, we consider this variation to be rare.

Resumo A importância clínica e cirúrgica do conhecimento anatômico do nervo musculocutâneo e de suas variações deve-se ao fato de que uma das complicações em diversos procedimentos cirúrgicos do membro superior envolve sua lesão. Em uma dissecação de rotina do membro superior direito de um cadáver masculino observamos uma variação anatômica desse nervo. O nervo musculocutâneo originou-se no fascículo lateral, seguiu lateralmente, passou sob o músculo coracobraquial e seguiu até seu primeiro ramo para o músculo bíceps braquial. Logo após forneceu mais dois ramos, o nervo cutâneo lateral do antebraço e um ramo para o músculo braquial, e então uniu-se ao nervo mediano. O nervo mediano seguiu medialmente no braço até a região da fossa cubital e deu então origem ao nervo intermédio anterior do antebraço. A união do nervo musculocutâneo com o nervo mediano aconteceu aproximadamente no ponto médio do braço e do nervo mediano. Tendo em vista que as classificações encontradas na literatura ou não abrangem nosso exemplo ou o mesmo se adequa a mais do que uma variação proposta, sem que tenhamos encontrado alguma fielmente semelhante, consideramos essa variação como rara.

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Keywords Arm/anatomy & histology; Musculocutaneous nerve/anatomy & histology; Median nerve/anatomy & histology; Anatomical variation; Upper limb

Palavras-chave Braço/anatomia e histologia; Nervo musculocutâneo/anatomia e histologia; Nervo mediano/anatomia e histologia; Variação anatômica; Membro superior

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Study carried out at Centro Universitário São Camilo, Laboratory of Human Anatomy, São Paulo, SP, Brazil.

© 2015 Sociedade Brasileira de Ortopedia e Traumatologia. Published by Elsevier Editora Ltda.

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