Nervus Phrenicus, or the phrenic nerve, is an important nerve that originates in the cervical plexus and supplies the diaphragm to facilitate breathing. There are several synonyms for nervus phrenicus such as the diaphragmatic nerve, the respiratory nerve, or the cervical nerve. The phrenic nerve plays a crucial role in respiratory function, and any damage or irritation to it can result in serious respiratory problems. Hence, it is important to know the different names associated with it. This knowledge can assist in medical diagnoses and effective communication between medical professionals and patients.