Lumbar Plexus V2 Practice Test 2026 – The Complete All-in-One Guide to Exam Success!

The key idea is which nerve supplies the iliacus, a hip flexor that sits in the iliac fossa. The iliacus is innervated by the femoral nerve (from the lumbar plexus L2–L4). The femoral nerve travels into the thigh and gives muscular branches to many anterior thigh muscles, including a branch to iliacus (often called the nerve to iliacus). This fits with the nerve’s overall role in powering hip flexion and thigh movement.

In contrast, the obturator nerve mainly innervates the medial thigh adductors, the superior gluteal nerve supplies the gluteus medius and minimus, and the sciatic nerve covers the posterior thigh and most of the leg—areas not specifically tied to iliacus.