some anatomic variations are described in this articles
"Anatomical variation in bifurcation and trifurcations of sciatic nerve and its clinical implications: in selected university in Ethiopia" by Berihu & Debeb
https://www.ncbi.nlm.nih.gov/pubmed/26526618
or in this one
"Variations in the high division of the sciatic nerve and relationship between the sciatic nerve and the piriformis" by Güvençer et al
https://www.ncbi.nlm.nih.gov/pubmed/19431123
The Sciatic Nerve is derived from anterior and posterior divisions of the lumbosacral plexus. The anterior division (branch) forms the tibial nerve (L4-S3) and the posterior division forms the common perineal nerve (L4-S2). This forms two terminal trunks within the sciatic nerve as it travels into the posterior thigh, the medial trunk or tibial nerve and the lateral trunk or common fibularis nerve. The sciatic nerve exits the pelvis through the greater sciatic foramen and passes under the piriformis muscle in vast majority of people, however there's a 21% of the population on which the common fibular division can pass through the piriformis muscle.The nerve will divide into separate tibial and common fibularis nerves at the following possible places: within the pelvis,gluteal region, midthigh or above the Popliteal fossa (being the popliteal fossa the place most usually it separates to be two: the common fibularis nerve that runs lateral and the tibial nerve that runs in the center.
the reference is a book: Human Anatomy by Martini Timmons Tallitshch , 8th Ed.
Dear Mohd Saleem,
here you find a link to our article that may help solve your interesting question:
https://www.researchgate.net/publication/244479995_Sciatic_Nerve_High_Division_Two_Different_Anatomical_Variants
Best regards from Portugal
Maria
Article Sciatic Nerve High Division: Two Different Anatomical Variants
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