College of Massage Therapists of British Columbia (CMTBC) Practice Exam

Which nerve shares a cutaneous area with the obturator nerve?

1. L1 - lateral thigh

2. L2 - medial thigh/groin

3. S1 - lateral leg

4. C8 - lower arm

The correct answer is: L2 - medial thigh/groin

The obturator nerve primarily supplies the medial compartment of the thigh, providing motor innervation to the adductor muscles and sensory innervation to a small area on the medial thigh. The cutaneous area it shares is primarily with the L2 nerve root, which also contributes to the sensory innervation of the medial thigh and groin region. Since the answer indicates L2 as having a shared cutaneous region with the obturator nerve, it aligns well with the anatomy of these nerves. Understanding that both the L2 nerve root and the obturator nerve contribute to sensory input in the same area helps clarify why this answer is the most accurate. The other options represent nerves that supply entirely different regions of the body, making them less relevant to the context of the question.