27 - Early Bifurcation of the Sciatic Nerve with Possible Entrapment of the Common Fibular Division by a Biceps Femoris Supernumerary Short Head Variant

Poster Board Number: 27
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Abstract Body : Variations of the sciatic nerve have clinical implications. For example, sciatic nerve variation can lead to piriformis syndrome, sciatica, and failed nerve blocks. Upon standard dissection of an 87-year-old male donor body, bilateral variant intrapelvic bifurcation of the sciatic nerve was discovered. The common fibular division of the sciatic nerve was found to exit the pelvis by piercing the piriformis while the tibial division travels deep to its muscle belly. In addition, the divisions of the sciatic nerve traveled in varying paths, with the common fibular division lying within the investing fascia of a supernumerary short head of the biceps femoris muscles, a novel finding that could lead to potential nerve entrapment. While intrapelvic bifurcation of the sciatic nerve is not rare, the unique course of the common fibular nerve intermediate to supernumerary hamstring musculature is particularly uncommon.