Outline the intercostal nerve supply and the diaphragmatic innervation relevant to chest wall sensation and movement.

Outline the intercostal nerve supply and the diaphragmatic innervation relevant to chest wall sensation and movement.

• A. Intercostal nerves arise from dorsal rami; phrenic nerve supplies intercostal muscles.
• B. Phrenic nerve supplies chest wall sensation; intercostal nerves innervate the diaphragm.
• C. Intercostal nerves T12 and L1 supply all chest wall; phrenic nerve supplies the thoracic cage.
• D. Intercostal nerves (ventral rami T1–T11) supply intercostal muscles and skin; the phrenic nerve (C3–C5) innervates the diaphragm.

Answer: (D)