what is the root value of phrenic nerve?
* Phrenic nerve (C3,C4,C5)- It descends in front of scalenus anterior muscle . * Descends down to enters thorax where it lies between subclan vein(in front) and subclan aery lies behind it . * Fuher it descends in front of hilum of the lungs (whereas vagus nerve descends behind the hilum of lungs) * It is mixed nerve sensory and motor.(both motor and sensory to diaphragm)
C3,4,5
C2,3,4
C4,5,6
C5,6,7
Bronchopulmonary Segments, Embryonic veins