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Variant Accessory Obturator Nerve ��? A Case Report and Embryological Review

Rohini M, Yogesh AS, Banerjee C, and Goyal M

Usually accessory obturator nerve arises from the ventral branches of the third and fourth lumbar ventral rami and passes deep to pectineus. It supplies pectineus and hip joint and then joins with the anterior division of the obturator nerve. Here, we report unilateral variation in an accessory obturator nerve on right side in an adult male cadaver. Accessory obturator nerve was found to be arising from the ventral rami of L 3 and 4. Then it entered in the femoral triangle crossing superficial to the pectinius. The accessory obturator nerve divided into three branches, one was supplying the pectineus from its superficial surface while another was supplying the hip joint. The third branch joined with the anterior division of the obturator nerve to form subsartorial plexus. On the right side, obturator nerve was found to be having its usual course except that its anterior division did not supply pectineus muscle. Clinicians should keep such variations in mind while performing hip surgeries, obturator nerve blockade and treating peripheral neuropathies