Cadaveric dissection in Saudi Arabia is not allowed for any purposes; therefore, it is difficult to know the types and incidence of abnormal anatomical variants in our population. We studied the anatomical variants of the sciatic nerve (SN) in the Saudi population in living persons in the pelvic region in relation to the piriformis muscle (PM) and its course in the thigh until it divides between the popliteal region and any anomalies of major branches. Materials & Methods: This is a prospective study done in a Saudi population only of 70 persons in King Fahd hospital of university in AL Khobar from 17 April 2015 to 15 March 2016 for fulfilment of master degree in clinical anatomy from Dammam university. It was performed by magnetic resonance imaging (MRI, 3 Tesla).

Keywords : Sciatic Nerve, Anatomical Variation, Piriformis Muscle, Saudi Arabia