Unusual Relationship between the Piriform Muscle and Sciatic, Inferior Gluteal and Posterior Femoral Cutaneous Nerves

Piriformis muscle syndrome has been increasingly recognized as a cause of leg pain. Overuse, strain, or anatomical variations of the relationship between the nerve and the piriformis muscle are thought to be the underlying causes of the entrapment of the sciatic nerve. We report a variation not prev...

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Autores principales:	Jacomo,A. L, Martinez,C. A. R, Saleh,S. O, Andrade,M, Akamatsu,F. E
Lenguaje:	English
Publicado:	Sociedad Chilena de Anatomía 2014
Materias:	Inferior gluteal nerve Sciatic nerve Piriformis muscle
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200008
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spelling	oai:scielo:S0717-950220140002000082015-11-16Unusual Relationship between the Piriform Muscle and Sciatic, Inferior Gluteal and Posterior Femoral Cutaneous NervesJacomo,A. LMartinez,C. A. RSaleh,S. OAndrade,MAkamatsu,F. E Inferior gluteal nerve Sciatic nerve Piriformis muscle Piriformis muscle syndrome has been increasingly recognized as a cause of leg pain. Overuse, strain, or anatomical variations of the relationship between the nerve and the piriformis muscle are thought to be the underlying causes of the entrapment of the sciatic nerve. We report a variation not previously described which was found during a routine dissection. During routine dissection of the left gluteal region of an adult male cadaver we observed a high division of the sciatic nerve and the presence of an accessory piriformis muscle. The sciatic nerve divided beneath the piriformis muscle and the common fibular nerve passed over the accessory piriformis muscle, whereas the tibial nerve reflected anteriorly to pass between the accessory piriformis and the superior gemellus muscle. Additionally, both nerves communicated with a side branch under the inferior border of the accessory piriformis muscle and the inferior gluteal nerve originated from the fibular nerve. Anatomical variations in the relationship between the piriformis muscle and the sciatic nerve may be present in up to 17% of the population. Six different variations have been described and none of them is similar to our description. Though complete understanding of the physiopathology of the piriformis muscle syndrome remains to be elucidated, knowledge of the possible anatomical variations may be useful for its adequate diagnosis and treatment.info:eu-repo/semantics/openAccessSociedad Chilena de AnatomíaInternational Journal of Morphology v.32 n.2 20142014-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200008en10.4067/S0717-95022014000200008
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Inferior gluteal nerve Sciatic nerve Piriformis muscle
spellingShingle	Inferior gluteal nerve Sciatic nerve Piriformis muscle Jacomo,A. L Martinez,C. A. R Saleh,S. O Andrade,M Akamatsu,F. E Unusual Relationship between the Piriform Muscle and Sciatic, Inferior Gluteal and Posterior Femoral Cutaneous Nerves
description	Piriformis muscle syndrome has been increasingly recognized as a cause of leg pain. Overuse, strain, or anatomical variations of the relationship between the nerve and the piriformis muscle are thought to be the underlying causes of the entrapment of the sciatic nerve. We report a variation not previously described which was found during a routine dissection. During routine dissection of the left gluteal region of an adult male cadaver we observed a high division of the sciatic nerve and the presence of an accessory piriformis muscle. The sciatic nerve divided beneath the piriformis muscle and the common fibular nerve passed over the accessory piriformis muscle, whereas the tibial nerve reflected anteriorly to pass between the accessory piriformis and the superior gemellus muscle. Additionally, both nerves communicated with a side branch under the inferior border of the accessory piriformis muscle and the inferior gluteal nerve originated from the fibular nerve. Anatomical variations in the relationship between the piriformis muscle and the sciatic nerve may be present in up to 17% of the population. Six different variations have been described and none of them is similar to our description. Though complete understanding of the physiopathology of the piriformis muscle syndrome remains to be elucidated, knowledge of the possible anatomical variations may be useful for its adequate diagnosis and treatment.
author	Jacomo,A. L Martinez,C. A. R Saleh,S. O Andrade,M Akamatsu,F. E
author_facet	Jacomo,A. L Martinez,C. A. R Saleh,S. O Andrade,M Akamatsu,F. E
author_sort	Jacomo,A. L
title	Unusual Relationship between the Piriform Muscle and Sciatic, Inferior Gluteal and Posterior Femoral Cutaneous Nerves
title_short	Unusual Relationship between the Piriform Muscle and Sciatic, Inferior Gluteal and Posterior Femoral Cutaneous Nerves
title_full	Unusual Relationship between the Piriform Muscle and Sciatic, Inferior Gluteal and Posterior Femoral Cutaneous Nerves
title_fullStr	Unusual Relationship between the Piriform Muscle and Sciatic, Inferior Gluteal and Posterior Femoral Cutaneous Nerves
title_full_unstemmed	Unusual Relationship between the Piriform Muscle and Sciatic, Inferior Gluteal and Posterior Femoral Cutaneous Nerves
title_sort	unusual relationship between the piriform muscle and sciatic, inferior gluteal and posterior femoral cutaneous nerves
publisher	Sociedad Chilena de Anatomía
publishDate	2014
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200008
work_keys_str_mv	AT jacomoal unusualrelationshipbetweenthepiriformmuscleandsciaticinferiorglutealandposteriorfemoralcutaneousnerves AT martinezcar unusualrelationshipbetweenthepiriformmuscleandsciaticinferiorglutealandposteriorfemoralcutaneousnerves AT salehso unusualrelationshipbetweenthepiriformmuscleandsciaticinferiorglutealandposteriorfemoralcutaneousnerves AT andradem unusualrelationshipbetweenthepiriformmuscleandsciaticinferiorglutealandposteriorfemoralcutaneousnerves AT akamatsufe unusualrelationshipbetweenthepiriformmuscleandsciaticinferiorglutealandposteriorfemoralcutaneousnerves
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Unusual Relationship between the Piriform Muscle and Sciatic, Inferior Gluteal and Posterior Femoral Cutaneous Nerves

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