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Bilateral variant of sciatic nerve exhibiting intra-pelvic division


Int J Med Res Health Sci. |

Authors: Rejeena P Raj, Kunjumon PC, More Anju B
Int J Med Res Health Sci. 2014;3(2):451-453 |  DOI:10.5958/j.2319-5886.3.2.092


Context (background): In case of high division of the sciatic nerve in the pelvis its, common peroneal component may pierce the Piriformis muscle. This anatomical variant can explain many clinical findings. Aims: Its objective is to report a case of high division of the sciatic nerve in order to contribute towards better anatomical understanding of the gluteal region. Methods and Material: Routine undergraduate dissection of a male cadaver revealed bilateral variation in sciatic nerve. Results: Sciatic nerve is dividing into tibial and common peroneal components in the pelvis. Common peroneal component is piercing through the piriformis muscle. Tibial component is emerging between piriformis and superior gemelli muscle. Conclusions: Sciatic nerve variation can lead to a Piriformis muscle syndrome, inadvertent injury during operations in the gluteal region, failure of sciatic nerve block and/or sciatic neuropathy. The differences in routes of these two nerve components can explain them.

Keywords: Common peroneal nerve, Pyriformis muscle, Piriformis syndrome, Sciatic nerve.

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