The 13th cranial nerve is known as the nervus terminalis or terminal nerve.
The Terminal Nerve: An Overview
The nervus terminalis, often referred to as the thirteenth cranial nerve, is a distinctive and highly conserved nerve found in humans and most vertebrates. It is situated just above the olfactory bulbs and its fibers extend from the front of the brain to the olfactory and nasal epithelia.
Key Features
- Location: Situated above the olfactory bulbs.
- Course: Fibers run from the rostral part of the brain to the olfactory and nasal epithelia.
- Conservation: Highly preserved across many vertebrate species.
- Alternative Names: Also called the nervus terminalis.
Function
The exact function of the terminal nerve is still being explored, but its location and connections suggest possible roles in chemosensation, reproductive behavior, and modulation of other neural pathways.
Why "Thirteenth" Cranial Nerve?
It's important to note that while the terminal nerve is often referred to as the thirteenth cranial nerve, it is not officially considered one of the twelve classical cranial nerves. This is due to its unique structure and different developmental origins compared to the other twelve cranial nerves. However, its significance as a neuroanatomical feature makes the term "thirteenth cranial nerve" common when discussing it.
Summary
| Nerve Name | Location | Fiber Course | Other Names |
|---|---|---|---|
| Nervus Terminalis | Above the olfactory bulbs | Rostral brain to the olfactory and nasal epithelia | Terminal Nerve, 13th Cranial Nerve |
