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Neurology- Cranial Nerves > Trochlear > Flashcards

Flashcards in Trochlear Deck (11)
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1

Which base of skull foramina does the trochlear nerve pass through?

Superior orbital fissure

2

What type of information is carried on the trochlear nerve?

Motor

3

What is the function of the trochlear nerve?

Motor supply to the superior oblique muscle

4

Where are the cell bodies of the motor neurones of CNIV located?

Midbrain trochlear nuclei

5

What are the functions of the superior oblique muscle?

Causes intorsion and depression of the eyeball

6

The trochlear nerve is the only cranial nerve to do what 2 things?

Decussate, and to exit the cranial cavity posteriorly

7

Once the trochlear nerve exits the midbrain (posteriorly), what does it do?

Wraps around the entire brainstem to find the anterior part again

8

What is the consequence of CNIV exiting posteriorly and travelling around the brainstem?

It is a long, thin nerve which is easily disrupted

9

Describe the intracranial course of the trochlear nerve?

Travels to the orbit along the lateral walls of the cavernous sinuses

10

Describe the extracranial course of the trochlear nerve?

Supplies the superior oblique in the orbit

11

How is the trochlear nerve tested?

H test to assess eye movements