| | Conditions & Treatments | Brain & Nervous System Most descriptive of the phrenic nerve? Phrenic nerve arises primarily from anterior rami of C4 and receives contributions from C3 and C5. It is solely motor in function. Brain & Nervous System - Related Articles What Is a Chill Seizure? How does a Serotonin Reuptake inhibitor help? Sciatica Relief Stretches Which systems provide a benefit to the nervous system? Which is more useful mri or eeg? What are three major functions of circulatory system? Differences Between Obtunded and Stupor