Phrenic nerve innervates the diaphragm. What is the root value of phrenic nerve?
Phrenic nerve :The phrenic nerve arises from the ventral rami of cervical spinal nerves C3-5 and courses down in the preveebral fascia.It courses veically along the anterior scalene muscle between the subclan aery and the subclan vein en route to innervate the diaphragm.It carries sensation from the mediastinal and diaphragmatic parietal pleura, the pericardium, and the parietal peritoneum under the diaphragm.
C2, C3, C4
C3, C4, C5
C4, C5, T1
C5, Tl, T2