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A case of bilateral high division of the sciatic nerves, together with a unilateral unusual course of the tibial nerve

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Author(s): Mas N | Ozeksi P | Ozdemir B | Kapakin S | Sargon MF | Celik HH | Yener N

Journal: Neuroanatomy
ISSN 1303-1783

Volume: 2;
Issue: 1;
Start page: 13;
Date: 2003;
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Keywords: Neuroanatomy | Anatomy | Sciatic | Nerve | Tibial | High division

ABSTRACT
In a 62-year-old male cadaver, high division of the sciatic nerve was observed bilaterally. Additionally, on the right side of the same cadaver, the common peroneal nerve passed just inferior to the piriformis muscle and the tibial nerve emerged inferior to the gemellus superior, between the gemellus superior and obturator internus muscles. Then, both of the nerves coursed posterior to the obturator internus, gemellus inferior and quadratus femoris muscles. The gemellus superior muscle, lying just posterior to the tibial nerve may cause to the symptoms of sciatica, because of the compression of the tibial nerve between the gemellus superior and obturator internus muscles. This pathology may lead to a new syndrome; the gemellus superior syndrome, just like the piriformis syndrome. As a conclusion, in the etiology and pathogenesis of sciatica, in addition to the priformis muscle, the abnormalities of the other gluteal external rotator muscles of the hip joint must also be taken into consideration by the clinicians. MR imaging of this region will be very helpful for the accurate diagnosis of this type of pathologies.
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