Subcostal Nerve T12 — FRCA Primary MCQ
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Correct answer: E — T12
The subcostal nerve is the ventral ramus of T12. It runs below the twelfth rib (not between two ribs like the intercostal nerves). It contributes to the lumbar plexus (T12-L1 forming the iliohypogastric nerve). It provides motor supply to the anterior abdominal wall muscles and sensory supply to the skin above the inguinal ligament.
Reference: RCoA 2021 Primary FRCA Curriculum