Lumbar Plexus Formation — FRCA Primary MCQ
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Correct answer: E — L1-L4 (with contribution from T12)
The lumbar plexus is formed from the ventral rami of L1-L4 with a contribution from T12 (the subcostal nerve). It lies within the substance of psoas major. Major branches include: iliohypogastric (T12-L1) / ilioinguinal (L1) / genitofemoral (L1-L2) / lateral cutaneous nerve of thigh (L2-L3) / femoral nerve (L2-L4) / obturator nerve (L2-L4).
Reference: RCoA 2021 Primary FRCA Curriculum