Cranial Nerves

Question 1

What are the order of the Cranial Nerves?

Answer 1

1. Olfactory
2. Optic
3. Oculomotor
4. Trochlear
5. Abducens
6. Trigeminal
7. Facial
8. Vestibulocochlear
9. Glossopharyngeal
10. Vagus
11. Hypoglossal
12. Accessory

Question 2

What does the Olfactory nerve supply?

Answer 2

• Gives you a special sense of smell

Question 3

What is the Route of the Olfactory Nerve?

Answer 3

• Temporal Lobe - Olfactory Tract (through the cribiform foramina) - Olfactory Bulb - Nasal Cavity

Question 4

What is the test for the Olfactory Nerve?

Answer 4

• Anosmia/ Hyposmia (loss of smell)

Question 5

What are the causes of Loss of Smell?

Answer 5

• Head/ Facial Injury
• Anterior CF Injury
• Parkinson’s, Alzheimer’s
• Upper Respiratory Tract infection ( lined with respiratory mucosa which is swollen - this stops chemicals reaching the olfactory nerves)

Question 6

What does the Optic Nerve Supply?

Answer 6

• Special Sense of Vision

Question 7

What is the route of the Optic Nerve?

Answer 7

• Retinal Ganglion - axons from the optic nerve - back of the orbit via the optic canal - fibres cross and merge to form the optic chiasm - optic tract - primary visual cortex - occipital lobe