CN I - III

Question 1

What are the 12 cranial nerves?

Answer 1

Ooh, Ooh, Ooh, to touch and feel very good velvet. Such heaven!

Olfactory 
Optic
Oculomotor
Trochlear
Trigeminal nerve
Abducent nerve
Facial nerve
Vestibulocochlar nerve
Glossopharyngeal nerve
Vagus nerve
(Spinal) Accessary nerve
Hypoglossal nerve

Question 2

Which cranial nerves do not originate from the brainstem?

Answer 2

Olfactory

Optic

Question 3

The olfactory nerve arises from…

Answer 3

…the olfactory receptor cells (bipolar neurons)

Question 4

Olfactory receptor cells lie in…

Answer 4

…the nasal cavity above the level of the superior nasal concha

Question 5

How do the olfactory receptor cells pick smell?

Answer 5

Their peripheral processes are lined with cilia called the olfactory hairs which project into the mucous membrane (in the nose) and react to odours/smells, stimulating the olfactory cells

Question 6

The fine central processes form the olfactory nerve fibres. True or false?

Answer 6

True

Question 7

The olfactory nerve fibers form bundles which pass through…

Answer 7

…the openings of the cribriform plate of the ethmoid bone to enter the olfactory bulb.

Question 8

Journey of the olfactory nerve

Answer 8

Olfactory receptor cells
|
Olfactory nerve fibres
|
Olfactory bulb
|
Olfactory tract
|
Olfactory striae

Question 9

The olfactory nerve fibers are myelinated. True or false?

Answer 9

False. They are unmyelinated and covered by Schwann cells.