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Copyright of Medicina (Buenos Aires) is the property of Medicina (Buenos Aires) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Argentinian Journal of Respiratory & Physical Therapy (AJRPT) is the property of Asociacion Civil Cientifica de Difusion y Promocion de la Kinesiologia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Argentinian Journal of Respiratory & Physical Therapy (AJRPT) is the property of Asociacion Civil Cientifica de Difusion y Promocion de la Kinesiologia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The sciatic nerve is the terminal branch of the sacral plexus, it is the thickest nerve of the body. Normally, exits the pelvis through greater sciatic foramen and enters the gluteal region below the piriformis muscle. Anatomical anomalies between these structures have been reported by several different authors. The purpouse of this report is to describe the anatomical variation found and to perform a bibliographic review of the topic. Upon routine dissection in the Department of Anatomy at the School of Kinesiology and Physiatry of the University of Buenos Aires, an anatomic variation in the emergence of the sciatic nerve from the pelvis to the gluteal compartment in a 70 years old male cadaver was discovered. In the left lower limb, the common peroneal nerve exits the pelvis superior to the piriformis muscle while the tibial nerve exits inferior to the piriformis. The sciatic nerve is not constituted since the branches do not form a common nerve trunk. Additionally, the ventral and dorsal components of the posterior femoral cutaneous nerve are located in the supra and infrapiriform foramen. At 6 weeks of development, the sciatic nerve is already constituted and the piriformis muscle is identified at 8 weeks. These suggest that the anatomical variations could be generated in previous phases to acquisition of definitive muscular insertion, which is evidenced around 15 weeks of development. Previous anatomical reports present anatomical variations in the origin and distribution of the SN in approximately 17% of cases. Beaton & Anson propose a classification which describes relationship between the piriformis and the sciatic nerve in six types. This case report is classified as type C and it represents 0.75-8% of cases according to several autors. The knowledge of different location of the sciatic nerve branches is of utmost importance as the gluteal region is the site of innumerable surgical manipulations as well as nerve injuries during deep intramuscular injections, failed sciatic nerve block in anaesthesia, injury during hip surgeries and piriformis syndrome. [ABSTRACT FROM AUTHOR]

Copyright of Medicina (Buenos Aires) is the property of Medicina (Buenos Aires) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)