Peripheral Diaphragm Intercostal Sensory — FRCA Primary MCQ
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Correct answer: D — The intercostal nerves T7-T12
The central diaphragm receives both motor and sensory supply from the phrenic nerve (C3-C5). The peripheral (costal) portion receives sensory supply from the lower intercostal nerves (T7-T12). This explains why central diaphragmatic irritation causes shoulder tip pain (phrenic/C3-C5 dermatome) while peripheral irritation causes lower chest/upper abdominal pain (T7-T12).
Reference: RCoA 2021 Primary FRCA Curriculum