terminal nerve

The terminal nerve, also known as cranial nerve 0 (CN 0), is a paired nerve found in vertebrates. Its exact function and status as a distinct nerve are still debated among scientists, with some considering it a vestigial structure.1

Cranial nerves, in general, are part of the peripheral nervous system and connect the head and upper torso's muscles and sensory organs directly to the brain. There are typically 12 pairs of cranial nerves in higher vertebrates, each with specific functions related to senses like smell, sight, and hearing, as well as controlling muscles and internal organs. The olfactory nerve (CN I), for example, is responsible for the sense of smell.12