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Variations in the high division of the sciatic nerve and relationship between the sciatic nerve and the piriformis.
Turk Neurosurg. 2009 Apr; 19(2):139-44.TN

Abstract

OBJECTIVE

The sciatic nerve (SN) separates into its branches, the tibial and common fibular nerves, outside the pelvis. However, it may rarely be separated within the pelvis. In such cases, the tibial nerve and the common fibular nerve may leave the pelvis through different routes. These variations may cause nerve compressions under other anatomic structures, resulting in non-discogenic sciatica. The aim of this study was to define the level of the SN exit and of the SN division.

MATERIAL AND METHOD

50 gluteal regions were examined in 25 formalin-fixed adult male cadavers.

RESULTS

In 52% of the cases, the SN exited the pelvis as a whole nerve without any division, whereas in 48% a high division was observed. Branches of the SN left the pelvis through the infrapiriform foramen (IP) as two separate nerves In 24%. One branch of the SN left the pelvis through the IP and other through a different route in another 24%.

CONCLUSION

The differences in the exit routes of these two nerves are important in clarifying the clinical etiology of nondiscogenic sciatica. These variations require reviewing the piriformis syndrome.

Authors+Show Affiliations

Dokuz Eylül University, Anatomy Department, Izmir, Turkey. mustafa.guvencer@deu.edu.trNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

19431123

Citation

Güvençer, Mustafa, et al. "Variations in the High Division of the Sciatic Nerve and Relationship Between the Sciatic Nerve and the Piriformis." Turkish Neurosurgery, vol. 19, no. 2, 2009, pp. 139-44.
Güvençer M, Iyem C, Akyer P, et al. Variations in the high division of the sciatic nerve and relationship between the sciatic nerve and the piriformis. Turk Neurosurg. 2009;19(2):139-44.
Güvençer, M., Iyem, C., Akyer, P., Tetik, S., & Naderi, S. (2009). Variations in the high division of the sciatic nerve and relationship between the sciatic nerve and the piriformis. Turkish Neurosurgery, 19(2), 139-44.
Güvençer M, et al. Variations in the High Division of the Sciatic Nerve and Relationship Between the Sciatic Nerve and the Piriformis. Turk Neurosurg. 2009;19(2):139-44. PubMed PMID: 19431123.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Variations in the high division of the sciatic nerve and relationship between the sciatic nerve and the piriformis. AU - Güvençer,Mustafa, AU - Iyem,Cihan, AU - Akyer,Pinar, AU - Tetik,Süleyman, AU - Naderi,Sait, PY - 2009/5/12/entrez PY - 2009/5/12/pubmed PY - 2009/8/15/medline SP - 139 EP - 44 JF - Turkish neurosurgery JO - Turk Neurosurg VL - 19 IS - 2 N2 - OBJECTIVE: The sciatic nerve (SN) separates into its branches, the tibial and common fibular nerves, outside the pelvis. However, it may rarely be separated within the pelvis. In such cases, the tibial nerve and the common fibular nerve may leave the pelvis through different routes. These variations may cause nerve compressions under other anatomic structures, resulting in non-discogenic sciatica. The aim of this study was to define the level of the SN exit and of the SN division. MATERIAL AND METHOD: 50 gluteal regions were examined in 25 formalin-fixed adult male cadavers. RESULTS: In 52% of the cases, the SN exited the pelvis as a whole nerve without any division, whereas in 48% a high division was observed. Branches of the SN left the pelvis through the infrapiriform foramen (IP) as two separate nerves In 24%. One branch of the SN left the pelvis through the IP and other through a different route in another 24%. CONCLUSION: The differences in the exit routes of these two nerves are important in clarifying the clinical etiology of nondiscogenic sciatica. These variations require reviewing the piriformis syndrome. SN - 1019-5149 UR - https://www.unboundmedicine.com/medline/citation/19431123/Variations_in_the_high_division_of_the_sciatic_nerve_and_relationship_between_the_sciatic_nerve_and_the_piriformis_ L2 - http://www.turkishneurosurgery.org.tr/pubmed.php3?year=2009&volume=19&issue=2&page=139 DB - PRIME DP - Unbound Medicine ER -