Anatomy Phrenic nerve is A Motor nerve to diaphragm B Arises chiefly from 3rd cervical nerve, also receives contribution from 4th and 5th cervical nerves C The nerve runs vertically on the anterior surface of scalenus anterior D It lies anterior to prevertebral fascia 💡 Explanation Phrenic nerve is ✓ Correct Answer: C. The nerve runs vertically on the anterior surface of scalenus anterior