Sciatic Nerve: Morphological Diversification in the Cadavers and Its Clinical Relevance: A Descriptive Observational Study

angle of the popliteal fossa.It is not uncommon for the two distinct components of the sciatic nerve to emanate from the lumbosacral plexus independently, following separate paths. AimOur study aimed to determine the morphometric and morphological diversification of the sciatic nerve. introductionThe sciatic nerve, which has the largest diameter at origin (approximately 2 cm), is the thickest peripheral nerve.It is formed in the lumbosacral plexus by the confluence of the anterior rami of the spinal nerves L4-S3, which converge behind the piriformis muscle. 1 Through the greater sciatic foramen, the sciatic nerve enters the gluteal region.It then passes along the lower border of the piriformis muscle, and subsequently it passes across the superior gemelli, the obturator internus, the inferior gemelli muscles, and the quadratus femoris.It subsequently continues its course posteriorly down the thigh to the popliteal fossa's superiormost angle.The sciatic nerve splits into the tibial and common peroneal nerves at this level, innervating distinct areas of the lower limb.The anterior division of the anterior rami of L4-S3 gives rise to the tibial nerve.In contrast, the posterior division of the anterior primary rami of L4-S2 gives rise to the common peroneal nerve.These two components are bound together within the same neural sheath. 2 The site where the sciatic nerve terminates is inconsistent.The most frequent site of termination is at the junction of the upper twothirds and lower one-third of the back of the thigh.The termination may occur at a site superior to or inferior to the usual termination location, such as within the gluteal region or below the superior 1-