The phrenic nerve originates through the cervical spinal roots C3, C4, and C5, and it truly is essential for initiating the respiratory method. This nerve serves equally motor functions for diaphragm contraction and sensory features for the pericardium and mediastinal pleura, such as the phrenic nerves.??u n?i Sang-a, NKC Súng phun s?n Devilbiss C