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Sciatic nerve high division: two different anatomical variants.
MedLine Citation:
PMID:  23815833     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Introduction: Sciatic nerve variations are relatively common. These variations are often very significant in several fields of Medicine. The purpose of this paper is to present two such variants and discuss their clinical implications. Material and Methods: Three Caucasian cadavers with no prior history of lower limb trauma or surgery were dissected and found to present anatomical variants of the sciatic nerve. Results: In all cases the sciatic nerve divided above the popliteal fossa. In two cases (cadavers 1 and 2) it divided on both sides in the inferior portion of the gluteal region in its two terminal branches: the common fibular and the tibial nerves. In another case (cadaver 3) the sciatic nerve was found to divide inside the pelvis just before coursing the greater sciatic notch. The common fibular nerve exited the pelvis above the pyriformis muscle and then passed along its posterior aspect, while the tibial nerve coursed deep to the pyriformis muscle. Discussion: According to the literature, the anatomical variant described in cadaver 3 is considered relatively rare. This variant can predispose to nerve entrapment and thus to the pyriformis syndrome, sciatica and coccygodynia. The high division of the sciatic nerve, as presented in cadavers 1 and 2, can make popliteal nerve blocks partially ineffective. Conclusion: The anatomical variants associated with a high division of the sciatic nerve, must always be born in mind, as they are relatively prevalent, and have important clinical implications, namely in Anesthesiology, Neurology, Sports Medicine and Surgery.
Abstract available from the publisher.
Authors:
Diogo Pais; Diogo Casal; Maria Alexandre Bettencourt Pires; Andrea Furtado; Tiago Bilhim; Maria Angélica-Almeida; João Goyri-O'Neill
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Publication Detail:
Type:  Journal Article     Date:  2013-06-28
Journal Detail:
Title:  Acta médica portuguesa     Volume:  26     ISSN:  1646-0758     ISO Abbreviation:  Acta Med Port     Publication Date:    2013 May-Jun
Date Detail:
Created Date:  2013-07-02     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7906803     Medline TA:  Acta Med Port     Country:  Portugal    
Other Details:
Languages:  eng     Pagination:  208-11     Citation Subset:  IM    
Affiliation:
Anatomy Department. Medical Sciences Faculty. New University of Lisbon. Lisbon. Portugal.
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