12 Cranial nerves

Cranial Nerve BASICS - The 12 cranial nerves and how to
REMEMBER them!
ICU Advantage

Basics of Cranial Nerves
Welcome to another lesson from ICU Advantage! In this lesson,
we will discuss the basics of cranial nerves and different ways to
remember them. Let's get started!

What are Cranial Nerves?
Cranial nerves are nerves that originate from the brain or
brainstem. There are 12 pairs of cranial nerves, numbered based
on where they emerge from the brain. These nerves relay
information to and from various parts of the head and neck.

There are two types of neurons involved in the relay of
information: afferent neurons, which carry signals from sensory
stimuli back to the brain, and efferent neurons, which carry
signals away from the brain to muscles or target cells.

The 12 Cranial Nerves
Now let's discuss each of the 12 cranial nerves:

 Cranial Nerve 1 (Olfactory Nerve) - Responsible for
sense of smell.
 Cranial Nerve 2 (Optic Nerve) - Responsible for vision.
 Cranial Nerve 3 (Oculomotor Nerve) - Primarily
involved in eye movement, eyelid elevation, pupillary
constriction, and lens accommodation.
 Cranial Nerve 4 (Trochlear Nerve) - Also involved in
eye movement.
 Cranial Nerve 6 (Abducens Nerve) - Plays a role in eye
movement, particularly abduction (moving lateral to the
outside of the eye).