Sciatic Nerve Lab Report

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Introduction: The sciatic nerve is the largest and thickest nerve in the human body, formed by anterior rami of L 4, 5, S 1, 2, 3 spinal segments. It is made up of two components, the common peroneal and tibial nerves, which are held together by the connective tissue sheath. It enters the gluteal region through the greater sciatic foramen below the piriformis muscle, descends on the back of thigh and usually divides into its terminal branches at the apex of popliteal fossa1. Variations in different level of terminal division of sciatic nerve and its relations with piriformis muscle have been reported. The variations in the course of sciatic nerve may lead to clinical condition like sciatica, piriformis syndrome and coccygodynia. Hence the…show more content…
In the present study, out of 30 cadavers, 3 cadavers on right side (10%) and 2 cadavers (6.67%) on left side showed variation in relation of sciatic nerve with the piriformis muscle. Type I variation of Beaton and Anson’s classification was found in 90%, type II in 6.67% and type III in 3.33% of cadavers on right side. On left side, only two types of variations were observed, the type I in 93.33% and type II in 6.67% of cadavers. 2. Terminal division of sciatic nerve was observed at three levels – Pelvic, Gluteal and Popliteal level (apex of popliteal fossa). 3. The measured length of sciatic nerve ranged from 2 cm to 42 cm and 3 cm to 42 cm on right and left sides respectively. The breadth of sciatic nerve at its origin varied from 1 cm to 2.5 cm on both sides. The thickness of sciatic nerve varied from 0.5 cm to 2 cm and 0.5 cm to 1.3 cm on right and left sides respectively. 4. However no variation in relation with piriformis and level of terminal division was observed in foetuses. The length of sciatic nerve in foetuses varied from 7.1 cm to 8 cm on both sides. The breadth of the nerve varied from 0.2 cm to 0.35 cm on the right side and 0.19 cm to 0.3 cm on the left side. The thickness of the sciatic nerve ranged from 0.09 cm to 0.12 cm on both

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