The "false CNS"

Question 1

Which two CN are not “true”? Why?

Answer 1

1 and 2- paired anterior extensions of the forebrain

Question 2

What is the brainstem? What are the 3 sections from sup to inf?

Answer 2

Connects the brain and SC.

Midbrain, pons, medulla

Question 3

What is the course of the olfactory nerve?

Answer 3

From the CNS along the olfactory tract to the olfactory bulb where nerves pass through the cribiform plate to catch smell from olfactory mucosa at roof of nose

Question 4

What fibres do the olfactory nerve carry?

Answer 4

SS

Question 5

What is the function of the olfactory nerve? How do you test?

Answer 5

Conveys sense of smell.

Ask pt if they have noticed any change in smell or taste of food, test smell of each nose in turn

Question 6

What is anosmia? What is the commonest cause?

Answer 6

Loss of sense of smell. URTI- cold, also head injury e.g BS #

Question 7

What is the course of the optic nerve?

Answer 7

Forebrain through optic canal (sphenoid bone), cross over at optic chiasm and enter retina through optic canal

Question 8

What type of fibres does the optic nerve carry?

Answer 8

SS

Question 9

What is the function of the optic nerve?

Answer 9

Vision

Question 10

How do you test the optic nerve?

Answer 10

AFRO- visual Acuity (Snelllen chart), visual Fields (H test), Reflexes (pupillary light and accommodation), fundOscopy