<P> Both of these nerves supply motor fibers to the diaphragm and sensory fibers to the fibrous pericardium, mediastinal pleura, and diaphragmatic peritoneum . </P> <P> Some sources describe the right phrenic nerve as innervating the gallbladder, other sources make no such mention . </P> <P> Pain arising from structures supplied by the phrenic nerve is often "referred" to other somatic regions served by spinal nerves C3 - C5 . For example, a subphrenic abscess beneath the right diaphragm might cause a patient to feel pain in the right shoulder . </P> <P> Irritation of the phrenic nerve (or the tissues supplied by it) leads to the hiccup reflex . A hiccup is a spasmodic contraction of the diaphragm, which pulls air against the closed folds of the larynx . </P>

Where do the phrenic and vagus nerves originate