Lumbar Plexus Abdominal Wall Below T12 — FRCA Primary MCQ

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ModerateAnatomyLumbar Plexus Abdominal Wall Below T12FRCA Primary

The subcostal nerve lies below the 12th rib. Below this level the abdominal wall receives segmental innervation from branches of which plexus?

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Correct answer: E — Lumbar plexus (T12-L4)

Below the subcostal nerve (T12) the abdominal wall is innervated by branches of the lumbar plexus: iliohypogastric (T12-L1) and ilioinguinal (L1). These nerves run in the transversus abdominis plane and are blocked by the TAP block. The inguinal region and groin receive sensory supply from L1 branches.

Reference: RCoA 2021 Primary FRCA Curriculum