The trigeminal nerve, also known as the fifth cranial nerve, is one of the largest nerves in the head and responsible for facial sensations such as touch, pain, and temperature. There are several synonyms for the trigeminal nerve, including the fifth nerve, trigeminus nerve, or simply the tri-facial nerve. In medical terminology, it is often abbreviated as CN5. The trigeminal nerve consists of three branches, which are the ophthalmic nerve, maxillary nerve, and mandibular nerve. Understanding the synonyms for the trigeminal nerve is essential in the medical field, as it helps medical professionals communicate effectively and accurately about a patient's condition.