Lumbar Plexus V2 Practice Test

The obturator nerve has root levels typically at:

L1–L2 L2–L3 L3–L4 L2–L4

Correct Answer:

L2–L4

Explanation:

Root levels are typically L2 to L4. These ventral rami join in the lumbar plexus to form the obturator nerve, which travels through the pelvis and exits via the obturator canal to reach the medial thigh. It innervates the medial thigh muscles—adductors such as adductor longus, brevis, and magnus (adductor part), plus gracilis and obturator externus—and provides sensation to the medial thigh. This L2–L4 range explains both the motor power to adduct the thigh and the sensory area, whereas using only L2–L3 or L3–L4 would omit part of the required contributions, and L1–L2 would not include the full L2–L4 input.

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